483 results match your criteria Atmospheric Environment[Journal]


Seasonal fluxes of carbon monoxide from an intensively grazed grassland in Scotland.

Atmos Environ (1994) 2018 Dec;194:170-178

Centre for Ecology and Hydrology, Bush Estate, Penicuik, EH26 0QB, UK.

Fluxes of carbon monoxide (CO) were measured using a fast-response quantum cascade laser absorption spectrometer and the eddy covariance method at a long-term intensively grazed grassland in southern Scotland. Measurements lasted 20 months from April 2016 to November 2017, during which normal agricultural activities continued. Observed fluxes followed a regular diurnal cycle, peaking at midday and returning to values near zero during the night, with occasional uptake observed. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S13522310183063
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http://dx.doi.org/10.1016/j.atmosenv.2018.09.039DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6358145PMC
December 2018
5 Reads

Estimating PM speciation concentrations using prototype 4.4 km-resolution MISR aerosol properties over Southern California.

Atmos Environ (1994) 2018 May 10;181:70-81. Epub 2018 Mar 10.

Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA, United States.

Research efforts to better characterize the differential toxicity of PM (particles with aerodynamic diameters less than or equal to 2.5 μm) speciation are often hindered by the sparse or non-existent coverage of ground monitors. The Multi-angle Imaging SpectroRadiometer (MISR) aboard NASA's Terra satellite is one of few satellite aerosol sensors providing information of aerosol shape, size and extinction globally for a long and continuous period that can be used to estimate PM speciation concentrations since year 2000. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2018.03.019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6288801PMC
May 2018
2 Reads

Isoprene Emission Response to Drought and the Impact on Global Atmospheric Chemistry.

Atmos Environ (1994) 2018 Jun;183:69-83

School of Natural Resources, University of Missouri, Columbia, MO, U.S., 65211.

Biogenic isoprene emissions play a very important role in atmospheric chemistry. These emissions are strongly dependent on various environmental conditions, such as temperature, solar radiation, plant water stress, ambient ozone and CO concentrations, and soil moisture. Current biogenic emission models (i. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2018.01.026DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6260947PMC

Field Determination of Multipollutant, Open Area Combustion Source Emission Factors with a Hexacopter Unmanned Aerial Vehicle.

Atmos Environ (1994) 2017 Oct;166(11):433-440

U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Research Triangle Park, NC 27711, USA.

An emission sensor/sampler system was coupled to a National Aeronautics and Space Administration (NASA) hexacopter unmanned aerial vehicle (UAV) to characterize gases and particles in the plumes emitted from open burning of military ordnance. The UAV/sampler was tested at two field sites with test and sampling flights spanning over 16 hours of flight time. The battery-operated UAV was remotely maneuvered into the plumes at distances from the pilot of over 600 m and at altitudes of up to 122 m above ground level. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.07.046DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6223134PMC
October 2017

Mobile Source Contributions to Ambient Ozone and Particulate Matter in 2025.

Atmos Environ (1994) 2018 Sep;188:129-141

ORISE participant hosted by the US EPA, Ann Arbor, MI 48105

The contribution of precursor emissions from 17 mobile source sectors to ambient ozone and fine particulate matter levels across the U.S. were evaluated, using the CAMx photochemical model, to identify which mobile source sectors are projected to have the largest impacts on air pollution in 2025. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S13522310183029
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http://dx.doi.org/10.1016/j.atmosenv.2018.04.057DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6192431PMC
September 2018
2 Reads

Impacts of climate and synoptic fluctuations on dust storm activity over the Middle East.

Atmos Environ (1994) 2018 Jan 14;173:265-276. Epub 2017 Nov 14.

Atmospheric Science and Meteorological Research Center (ASMERC), Tehran, Iran.

Dust events in the Middle East are becoming more frequent and intense in recent years with impacts on air quality, climate, and public health. In this study, the relationship between dust, as determined from Aerosol Optical Depth (AOD) and meteorological parameters (precipitation, temperature, pressure and wind field) are examined using monthly data from 2000 to 2015 for desert areas in two areas, Iraq-Syria and Saudi Arabia. Bivariate regression analysis between monthly temperature data and AOD reveals a high correlation for Saudi Arabia (R = 0. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S13522310173076
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http://dx.doi.org/10.1016/j.atmosenv.2017.11.016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6192056PMC
January 2018
13 Reads

The value of using seasonality and meteorological variables to model intra-urban PM variation.

Atmos Environ (1994) 2018 Jun 8;182:1-8. Epub 2018 Mar 8.

Department of Environmental Health Sciences, School of Public Health, Indiana University, 1025 E 7 Street. Bloomington IN, 47405 USA.

A yearlong air monitoring campaign was conducted to assess the impact of local temperature, relative humidity, and wind speed on the temporal and spatial variability of PM in El Paso, Texas. Monitoring was conducted at four sites purposely selected to capture the local traffic variability. Effects of meteorological events on seasonal PM variability were identified. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2018.03.007DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6166668PMC
June 2018
1 Read

Enhancements to AERMOD's Building Downwash Algorithms based on Wind-Tunnel and Embedded-LES Modeling.

Atmos Environ (1994) 2018 Apr;179:321-330

Applied Research Associates, Inc., Research Triangle Park, NC, USA.

Knowing the fate of effluent from an industrial stack is important for assessing its impact on human health. AERMOD is one of several Gaussian plume models containing algorithms to evaluate the effect of buildings on the movement of the effluent from a stack. The goal of this study is to improve AERMOD's ability to accurately model important and complex building downwash scenarios by incorporating knowledge gained from a recently completed series of wind tunnel studies and complementary large eddy simulations of flow and dispersion around simple structures for a variety of building dimensions, stack locations, stack heights, and wind angles. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2018.02.022DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6145471PMC

The reduction of summer sulfate and switch from summertime to wintertime PM concentration maxima in the United States.

Atmos Environ (1994) 2017 Dec;175:25-32

National Center for Environmental Assessment, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, USA.

Exposure to particulate matter air pollution with a nominal mean aerodynamic diameter less than or equal to 2.5 μm (PM) has been associated with health effects including cardiovascular disease and death. Here, we add to the understanding of urban and rural PM concentrations over large spatial and temporal scales in recent years. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.11.055DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6134864PMC
December 2017

Numerical analysis of pollutant dispersion around elongated buildings: an embedded large eddy simulation approach.

Atmos Environ (1994) 2018 Aug;187:117-130

Oak Ridge Institute for Science and Education, Oak Ridge, TN, USA.

High fidelity, scale-resolving numerical simulations of flow and pollutant dispersion around several elongated isolated buildings are presented in this paper. The embedded large eddy simulation (ELES) is used to model flow and concentration fields for six test cases with various source-building geometries. Specifically, the influence of building aspect ratio, wind direction, and source location is examined with these cases. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2018.05.053DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6104404PMC
August 2018
16 Reads

Oxidative Potential of Ambient Particulate Matter in Beirut during Saharan and Arabian Dust Events.

Atmos Environ (1994) 2018 Sep 13;188:34-42. Epub 2018 Jun 13.

Department of Civil and Environmental Engineering, University of Southern California, 3620 South Vermont Avenue, Los Angeles, California, 90089, USA.

In this study, we examine the oxidative potential of airborne particulate matter (PM) in Beirut, Lebanon, as influenced by dust events originating in the Sahara and Arabian deserts. Segregated fine (< 2.5 μm) and coarse (2. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2018.06.016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6063373PMC
September 2018
2 Reads
3.281 Impact Factor

Source Characterization and Exposure Modeling of Gas-Phase Polycyclic Aromatic Hydrocarbon (PAH) Concentrations in Southern California.

Atmos Environ (1994) 2018 Mar 8;177:175-186. Epub 2018 Jan 8.

Program in Public Health, College of Health Sciences, University of California, Irvine, CA, 92697, U.S.A.

Airborne exposures to polycyclic aromatic hydrocarbons (PAHs) are associated with adverse health outcomes. Because personal air measurements of PAHs are labor intensive and costly, spatial PAH exposure models are useful for epidemiological studies. However, few studies provide adequate spatial coverage to reflect intra-urban variability of ambient PAHs. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2018.01.014DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5968832PMC
March 2018
3 Reads

An example of aerosol pattern variability over bright surface using high resolution MODIS MAIAC: The eastern and western areas of the Dead Sea and environs.

Atmos Environ (1994) 2017 Sep 29;165:359-369. Epub 2017 Jun 29.

Tel Aviv University, AIRO Lab, Department of Geography and Human Environment, School of Geosciences, Israel.

The extreme rate of evaporation of the Dead Sea (DS) has serious implicatios for the surrounding area, including atmospheric conditions. This study analyzes the aerosol properties over the western and eastern parts of the DS during the year 2013, using MAIAC (Multi-Angle Implementation of Atmospheric Correction) for MODIS, which retrieves aerosol optical depth (AOD) data at a resolution of 1km. The main goal of the study is to evaluate MAIAC over the study area and determine, for the first time, the prevailing aerosol spatial patterns. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S13522310173043
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http://dx.doi.org/10.1016/j.atmosenv.2017.06.047DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5949884PMC
September 2017
4 Reads

Mutagenic atmospheres resulting from the photooxidation of aromatic hydrocarbon and NO mixtures.

Atmos Environ (1994) 2018 Apr;178:164-172

National Exposure Research Laboratory, United States Environmental Protection Agency, Research Triangle Park, North Carolina, United States.

Although many volatile organic compounds (VOCs) are regulated to limit air pollution and the consequent health effects, the photooxidation products generally are not. Thus, we examined the mutagenicity in TA100 of photochemical atmospheres generated in a steady-state atmospheric simulation chamber by irradiating mixtures of single aromatic VOCs, NO, and ammonium sulfate seed aerosol in air. The 10 VOCs examined were benzene; toluene; ethylbenzene; -, -, and -xylene; 1,2,4- and 1,3,5-trimethylbenzene; -cresol; and naphthalene. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5921836PMC
April 2018
1 Read

Accuracy and practicality of a portable ozone monitor for personal exposure estimates.

Atmos Environ (1994) 2018 Feb 24;175:120-126. Epub 2017 Nov 24.

Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, NJ 08854.

Accurate measurements of personal exposure to atmospheric pollutants such as ozone are important for understanding health risks. We tested a new personal ozone monitor (POM; 2B Technologies) for accuracy, precision, and ease of use. The POM's measurements were compared to simultaneous ozone measurements from a 2B Model 205 monitor and a ThermoScientific 49i monitor, and multiple POMs were placed side-by-side to check precision. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.11.036DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5918273PMC
February 2018

Impacts of a large boreal wildfire on ground level atmospheric concentrations of PAHs, VOCs and ozone.

Atmos Environ (1994) 2018 Apr;178:19-30

Wood Buffalo Environmental Association, 100-330 Thickwood Blvd., T9K 1Y1, Fort McMurray, AB, Canada.

During May 2016 a very large boreal wildfire burned throughout the Athabasca Oil Sands Region (AOSR) in central Canada, and in close proximity to an extensive air quality monitoring network. This study examines speciated 24-h integrated polycyclic aromatic hydrocarbon (PAH) and volatile organic compound (VOC) measurements collected every sixth day at four and seven sites, respectively, from May to August 2016. The sum of PAHs (ΣPAH) was on average 17 times higher in fire-influenced samples (852 ng m, n = 8), relative to non-fire influenced samples (50 ng m, n = 64). Read More

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http://dx.doi.org/10.1016/j.atmosenv.2018.01.013DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5906807PMC
April 2018
2 Reads

Ozonolysis of α/β-farnesene mixture: analysis of gas-phase and particulate reaction products.

Atmos Environ (1994) 2017 Nov;169:175-192

U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, USA.

Atmospheric oxidation of sesquiterpenes has been of considerable interest recently because of their likely contribution to ambient organic aerosol, but farnesene oxidation has been reported in only a few studies and with limited data. In the present study, a detailed chemical analysis of the organic fraction of gas and particle phases originating from the ozonolysis of a mixture of α-farnesene and β-farnesene was carried out in a 14.5 m smog chamber. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5906810PMC
November 2017
5 Reads

Sensitivity analysis of the near-road dispersion model RLINE - an evaluation at Detroit, Michigan.

Atmos Environ (1994) 2018 May 21;181:135-144. Epub 2018 Mar 21.

Environmental Health Sciences, University of Michigan, 1415 Washington Heights, Ann Arbor, MI USA 48109.

The development of accurate and appropriate exposure metrics for health effect studies of traffic-related air pollutants (TRAPs) remains challenging and important given that traffic has become the dominant urban exposure source and that exposure estimates can affect estimates of associated health risk. Exposure estimates obtained using dispersion models can overcome many of the limitations of monitoring data, and such estimates have been used in several recent health studies. This study examines the sensitivity of exposure estimates produced by dispersion models to meteorological, emission and traffic allocation inputs, focusing on applications to health studies examining near-road exposures to TRAP. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2018.03.009DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5889051PMC
May 2018
1 Read

Development of High-Resolution Dynamic Dust Source Function -A Case Study with a Strong Dust Storm in a Regional Model.

Atmos Environ (1994) 2017 Jun 29;159:11-25. Epub 2017 Mar 29.

NOAA, Geophysical Fluid Dynamics Laboratory, Princeton, NJ, USA.

A high-resolution dynamic dust source has been developed in the NASA Unified-Weather Research and Forecasting (NU-WRF) model to improve the existing coarse static dust source. In the new dust source map, topographic depression is in 1-km resolution and surface bareness is derived using the Normalized Difference Vegetation Index (NDVI) data from Moderate Resolution Imaging Spectroradiometer (MODIS). The new dust source better resolves the complex topographic distribution over the Western United States where its magnitude is higher than the existing, coarser resolution static source. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.03.045DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5887124PMC

NO to NO Conversion Rate Analysis and Implications for Dispersion Model Chemistry Methods using Las Vegas, Nevada Near-Road Field Measurements.

Atmos Environ (1994) 2017 Sep;165:23-24

U.S. Environmental Protection Agency, Office of Research and Development, National Center for Environmental Assessment, 109 TW Alexander Dr., RTP, NC 27711.

The nitrogen dioxide/oxides of nitrogen (NO/NO) ratio is an important surrogate for NO to NO chemistry in dispersion models when estimating NO impacts in a near-road environment. Existing dispersion models use different techniques and assumptions to represent NO to NO conversion and do not fully characterize all of the important atmospheric chemical and mechanical processes. Thus, "real-world" ambient measurements must be analyzed to assess the behavior of NO/NO ratios near roadways. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5846501PMC
September 2017

Factors associated with NO and NO concentration gradients near a highway.

Atmos Environ (1994) 2017 Nov;174:214-226

National Risk Management Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, 109 TW Alexander Drive, E343-02, Research Triangle Park, NC, 27711, USA.

The objective of this research is to learn how the near-road gradient, in which NO and NO (NO + NO) concentrations are elevated, varies with changes in meteorological and traffic variables. Measurements of NO and NO were obtained east of I-15 in Las Vegas and fit to functions whose slopes (dC /dx and dC /dx, respectively) characterize the size of the near-road zone where NO and NO concentrations from mobile sources on the highway are elevated. These metrics were used to learn about the near-road gradient by modeling dC /dx and dC /dx as functions of meteorological variables (e. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.11.026DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5812691PMC
November 2017

Comparisons of Traffic-Related Ultrafine Particle Number Concentrations Measured in Two Urban Areas by Central, Residential, and Mobile Monitoring.

Atmos Environ (1994) 2017 Nov 4;169:113-127. Epub 2017 Sep 4.

Department of Civil and Environmental Engineering, Tufts University, 200 College Avenue, Medford, MA 02155, USA.

Traffic-related ultrafine particles (UFP; <100 nanometers diameter) are ubiquitous in urban air. While studies have shown that UFP are toxic, epidemiological evidence of health effects, which is needed to inform risk assessment at the population scale, is limited due to challenges of accurately estimating UFP exposures. Epidemiologic studies often use empirical models to estimate UFP exposures; however, the monitoring strategies upon which the models are based have varied between studies. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.09.003DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5761336PMC
November 2017
5 Reads

Comparing on-road real-time simultaneous in-cabin and outdoor particulate and gaseous concentrations for a range of ventilation scenarios.

Atmos Environ (1994) 2017 Oct;166:130-141

Aerosol and Air Quality Research Laboratory, Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, USA.

Advanced automobile technology, developed infrastructure, and changing economic markets have resulted in increasing commute times. Traffic is a major source of harmful pollutants and consequently daily peak exposures tend to occur near roadways or while traveling on them. The objective of this study was to measure simultaneous real-time particulate matter (particle numbers, lung-deposited surface area, PM, particle number size distributions) and CO concentrations outside and in-cabin of an on-road car during regular commutes to and from work. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S13522310173045
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http://dx.doi.org/10.1016/j.atmosenv.2017.07.016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5743207PMC
October 2017
7 Reads

A chamber study of alkyl nitrate production formed by terpene ozonolysis in the presence of NO and alkanes.

Atmos Environ (1994) 2017 Dec;171:132-148

Exposure Assessment Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, WV 26505, United States.

Organic nitrates are relatively long-lived species and have been shown to have a potential impact on atmospheric chemistry on local, regional, and even global scales. However, the significance of these compounds in the indoor environment remains to be seen. This work describes an impinger-based sampling and analysis technique for organic nitrate species, focusing on formation via terpene ozonolysis in the presence of nitric oxide (NO). Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.10.002DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6379914PMC
December 2017

Characteristics of PM Concentrations across Beijing during 2013-2015.

Atmos Environ (1994) 2016 Nov 23;145:104-114. Epub 2016 Aug 23.

College of Environmental Science and Engineering, Fujian Normal University, Fuzhou, 350007, China.

High concentrations of particulate matter (PM) and frequent air pollution episodes in Beijing have attracted widespread attention. This paper utilizes data from the new air pollution network in China to examine the current spatial and temporal variability of PM at 12 monitoring sites in Beijing over a recent 2-year period (April 2013) to March 2015). The long term (2-year) average concentration was 83 µg·m, well above Chinese and international standards. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2016.08.060DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5650241PMC
November 2016
9 Reads

Exposure assessment models for elemental components of particulate matter in an urban environment: A comparison of regression and random forest approaches.

Atmos Environ (1994) 2017 Feb 1;151:1-11. Epub 2016 Dec 1.

Division of Biostatistics and Epidemiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.

Exposure assessment for elemental components of particulate matter (PM) using land use modeling is a complex problem due to the high spatial and temporal variations in pollutant concentrations at the local scale. Land use regression (LUR) models may fail to capture complex interactions and non-linear relationships between pollutant concentrations and land use variables. The increasing availability of big spatial data and machine learning methods present an opportunity for improvement in PM exposure assessment models. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2016.11.066DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5611888PMC
February 2017
8 Reads

Regionalized PM2.5 Community Multiscale Air Quality model performance evaluation across a continuous spatiotemporal domain.

Atmos Environ (1994) 2017 Jan;148:258-265

Department of Environmental Sciences and Engineering, UNC, 135 Dauer Drive, Chapel Hill, NC 27599-7431.

The regulatory Community Multiscale Air Quality (CMAQ) model is a means to understanding the sources, concentrations and regulatory attainment of air pollutants within a model's domain. Substantial resources are allocated to the evaluation of model performance. The Regionalized Air quality Model Performance (RAMP) method introduced here explores novel ways of visualizing and evaluating CMAQ model performance and errors for daily Particulate Matter ≤ 2. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2016.10.048DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5571875PMC
January 2017
40 Reads

Simultaneously reducing CO and particulate exposures via fractional recirculation of vehicle cabin air.

Atmos Environ (1994) 2017 Jul;160:77-88

Spokane Research Laboratory, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Spokane, WA, USA.

Prior studies demonstrate that air recirculation can reduce exposure to nanoparticles in vehicle cabins. However when people occupy confined spaces, air recirculation can lead to carbon dioxide (CO) accumulation which can potentially lead to deleterious effects on cognitive function. This study proposes a fractional air recirculation system for reducing nanoparticle concentration while simultaneously suppressing CO levels in the cabin. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.04.014DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5544137PMC
July 2017
3 Reads

Cytotoxic and genotoxic responses of human lung cells to combustion smoke particles of Miscanthus straw, softwood and beech wood chips.

Atmos Environ (1994) 2017 Aug 17;163:138-154. Epub 2017 May 17.

Department of Earth and Environmental Science and Center of Excellence in Environmental Toxicology, University of Pennsylvania, Philadelphia, PA 19104-6316, USA.

Inhalation of particulate matter (PM) from residential biomass combustion is epidemiologically associated with cardiovascular and pulmonary diseases. This study investigates PM emissions from combustion of commercial Miscanthus straw (MS), softwood chips (SWC) and beech wood chips (BWC) in a domestic-scale boiler (40 kW). The PM emitted during combustion of the MS, SWC and BWC were characterized by ICP-MS/OES, XRD, SEM, TEM, and DLS. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.05.019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6275551PMC
August 2017
1 Read
3.281 Impact Factor

Sample integrity evaluation and EPA method 325B interlaboratory comparison for select volatile organic compounds collected diffusively on Carbopack X sorbent tubes.

Atmos Environ (1994) 2017 Aug;163:99-106

Jacobs Technology Inc., Research Triangle Park, NC, USA.

A sample integrity evaluation and an interlaboratory comparison were conducted in application of U.S. Environmental Protection Agency (EPA) Methods 325A and 325B for diffusively monitoring benzene and other selected volatile organic compounds (VOCs) using Carbopack X sorbent tubes. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.05.042DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6261320PMC
August 2017
1 Read

A small, lightweight multipollutant sensor system for ground-mobile and aerial emission sampling from open area sources.

Atmos Environ (1994) 2017 Apr;154:31-41

U.S. EPA Office of Research and Development, 109 T.W. Alexander Drive, Durham, NC 27709, USA.

Characterizing highly dynamic, transient, and vertically lofted emissions from open area sources poses unique measurement challenges. This study developed and applied a multipollutant sensor and time-integrated sampler system for use on mobile applications such as vehicles, tethered balloons (aerostats) and unmanned aerial vehicles (UAVs) to determine emission factors. The system is particularly applicable to open area sources, such as forest fires, due to its light weight (3. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S13522310173002
Publisher Site
http://dx.doi.org/10.1016/j.atmosenv.2017.01.029DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6223182PMC
April 2017
14 Reads

Emissions from prescribed burning of timber slash piles in Oregon.

Atmos Environ (1994) 2017 Feb 12;150:395-406. Epub 2016 Nov 12.

Oregon Department of Forestry Fire Protection, 2600 State St., Salem, OR 97310, USA.

Emissions from burning piles of post-harvest timber slash (Douglas fir) in Grande Ronde, Oregon were sampled using an instrument platform lofted into the plume using a tether- controlled aerostat or balloon. Emissions of carbon monoxide, carbon dioxide, methane, particulate matter (PM), black carbon, ultraviolet absorbing PM, elemental/organic carbon, filter-based metals, polycyclic aromatic hydrocarbons (PAHs), polychlorinated dibenzodioxins/dibenzofurans (PCDD/PCDF), and volatile organic compounds (VOCs) were sampled to determine emission factors, the amount of pollutant formed per amount of biomass burned. The effect on emissions from covering the piles with polyethylene (PE) sheets to prevent fuel wetting versus uncovered piles was also determined. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2016.11.034DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6355151PMC
February 2017

Regional and Hemispheric Influences on Temporal Variability in Baseline Carbon Monoxide and Ozone over the Northeast US.

Atmos Environ (1994) 2017 ;164:309-324

Department of Geography and Planning, University of Toronto, Toronto, ON M5S 3G3, Canada.

Interannual variability in baseline carbon monoxide (CO) and ozone (O), defined as mixing ratios under minimal influence of recent and local emissions, was studied for seven rural sites in the Northeast US over 2001 - 2010. Annual baseline CO exhibited statistically significant decreasing trends (-4.3 - -2. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.06.017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6104834PMC
January 2017

Does temperature nudging overwhelm aerosol radiative effects in regional integrated climate models?

Atmos Environ (1994) 2017 ;154:42-52

Research Center for Air Pollution and Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, PR China.

Nudging (data assimilation) is used in many regional integrated meteorology-air quality models to reduce biases in simulated climatology. However, in such modeling systems, temperature changes due to nudging could compete with temperature changes induced by radiatively active and hygroscopic short-lived tracers leading to two interesting dilemmas: when nudging is continuously applied, what are the relative sizes of these two radiative forces at regional and local scales? How do these two forces present in the free atmosphere differ from those present at the surface? This work studies these two issues by converting temperature changes due to nudging into pseudo radiative effects (PRE) at the surface (PRE_sfc), in troposphere (PRE_atm), and at the top of atmosphere (PRE_toa), and comparing PRE with the reported aerosol radiative effects (ARE). Results show that the domain-averaged PRE_sfc is smaller than ARE_sfc estimated in previous studies and this work, but could be significantly larger than ARE_sfc at local scales. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.01.040DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6104850PMC
January 2017
2 Reads

Dynamic Evaluation of Two Decades of WRF-CMAQ Ozone Simulations over the Contiguous United States.

Atmos Environ (1994) 2017 ;164:102-116

EPRI, Palo Alto, CA, USA.

Dynamic evaluation of the fully coupled Weather Research and Forecasting (WRF)- Community Multi-scale Air Quality (CMAQ) model ozone simulations over the contiguous United States (CONUS) using two decades of simulations covering the period from 1990 to 2010 is conducted to assess how well the changes in observed ozone air quality are simulated by the model. The changes induced by variations in meteorology and/or emissions are also evaluated during the same timeframe using spectral decomposition of observed and modeled ozone time series with the aim of identifying the underlying forcing mechanisms that control ozone exceedances and making informed recommendations for the optimal use of regional-scale air quality models. The evaluation is focused on the warm season's (i. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.05.020DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6071429PMC
January 2017

Constraints on primary and secondary particulate carbon sources using chemical tracer and C methods during CalNex-Bakersfield.

Atmos Environ (1994) 2017 ;166:204-214

National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina.

The present study investigates primary and secondary sources of organic carbon for Bakersfield, CA, USA as part of the 2010 CalNex study. The method used here involves integrated sampling that is designed to allow for detailed and specific chemical analysis of particulate matter (PM) in the Bakersfield airshed. To achieve this objective, filter samples were taken during thirty-four 23-hr periods between 19 May and 26 June 2010 and analyzed for organic tracers by gas chromatography - mass spectrometry (GC-MS). Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.07.025DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5906818PMC
January 2017
4 Reads

Ultrafine particle size as a tracer for aircraft turbine emissions.

Atmos Environ (1994) 2016 Aug 10;139:20-29. Epub 2016 May 10.

University of Washington Department of Civil & Environmental Engineering, Box 352700 Seattle, WA, 98198. +1 (206) 543-6815.

Ultrafine particle number (UFPN) and size distributions, black carbon, and nitrogen dioxide concentrations were measured downwind of two of the busiest airports in the world, Los Angeles International Airport (LAX) and Hartsfield-Jackson International Airport (ATL - Atlanta, GA) using a mobile monitoring platform. Transects were located between 5 km and 10 km from the ATL and LAX airports. In addition, measurements were taken at 43 additional urban neighborhood locations in each city and on freeways. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5082839PMC
http://dx.doi.org/10.1016/j.atmosenv.2016.05.016DOI Listing
August 2016
6 Reads

A bias in the "mass-normalized" DTT response - an effect of non-linear concentration-response curves for copper and manganese.

Atmos Environ (1994) 2016 Nov 4;144:325-334. Epub 2016 Sep 4.

Department of Land, Air, and Water Resources, University of California, Davis.

The dithiothreitol (DTT) assay is widely used to measure the oxidative potential of particulate matter. Results are typically presented in mass-normalized units (e.g. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2016.08.071DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5031483PMC
November 2016
4 Reads

Scripted drives: A robust protocol for generating exposures to traffic-related air pollution.

Atmos Environ (1994) 2016 Oct 12;143:290-299. Epub 2016 Aug 12.

EOHSI - Clinical Research and Occupational Medicine Division, Rutgers University, 170 Frelinghuysen Road, Piscataway NJ 08854; Rutgers School of Public Health.

Commuting in automobiles can contribute substantially to total traffic-related air pollution (TRAP) exposure, yet measuring commuting exposures for studies of health outcomes remains challenging. To estimate real-world TRAP exposures, we developed and evaluated the robustness of a scripted drive protocol on the NJ Turnpike and local roads between April 2007 and October 2014. Study participants were driven in a car with closed windows and open vents during morning rush hours on 190 days. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2016.08.038DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5019181PMC
October 2016
5 Reads

Development of Long-term Spatiotemporal Models for Ambient Ozone in Six Metropolitan regions of the United States: The MESA Air Study.

Atmos Environ (1994) 2015 Dec 17;123(A):79-87. Epub 2015 Oct 17.

Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA.

Background: Current epidemiologic studies rely on simple ozone metrics which may not appropriately capture population ozone exposure. For understanding health effects of long-term ozone exposure in population studies, it is advantageous for exposure estimation to incorporate the complex spatiotemporal pattern of ozone concentrations at fine scales.

Objective: To develop a geo-statistical exposure prediction model that predicts fine scale spatiotemporal variations of ambient ozone in six United States metropolitan regions. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2015.10.042DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5021184PMC
December 2015
27 Reads

Limonene ozonolysis in the presence of nitric oxide: Gas-phase reaction products and yields.

Atmos Environ (1994) 2016 May;132:300-308

Exposure Assessment Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, 1095 Willowdale Road Morgantown, WV 26505, USA.

The reaction products from limonene ozonolysis were investigated using the new carbonyl derivatization agent, --butylhydroxylamine hydrochloride (TBOX). With ozone (O) as the limiting reagent, five carbonyl compounds were detected. The yields of the carbonyl compounds are discussed with and without the presence of a hydroxyl radical (OH•) scavenger, giving insight into the influence secondary OH radicals have on limonene ozonolysis products. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S13522310163017
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http://dx.doi.org/10.1016/j.atmosenv.2016.03.003DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4920481PMC
May 2016
7 Reads

Characterization of water-soluble organic matter in urban aerosol by H-NMR spectroscopy.

Atmos Environ (1994) 2016 Mar;128(March 2016):235-245

University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States; University of Alabama at Birmingham, Birmingham, AL 35216, United States.

The functional and C isotopic compositions of water-soluble organic carbon (WSOC) in atmospheric aerosol were determined by nuclear magnetic resonance (H-NMR) and isotope ratio mass spectrometry (IRMS) in an urban location in the Southern Mississippi Valley. The origin of WSOC was resolved using the functional distribution of organic hydrogen, δC ratio, and positive matrix factorization (PMF). Three factors were retained based on NMR spectral bins loadings. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2015.12.067DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4905722PMC
March 2016
54 Reads

Correlations between short-term mobile monitoring and long-term passive sampler measurements of traffic-related air pollution.

Atmos Environ (1994) 2016 May;132:229-239

University of Washington Department of Environmental and Occupational Health Sciences, Box 357234, Seattle, WA, 98198. +1 (206) 543-3222.

Mobile monitoring has provided a means for broad spatial measurements of air pollutants that are otherwise impractical to measure with multiple fixed site sampling strategies. However, the larger the mobile monitoring route the less temporally dense measurements become, which may limit the usefulness of short-term mobile monitoring for applications that require long-term averages. To investigate the stationarity of short-term mobile monitoring measurements, we calculated long term medians derived from a mobile monitoring campaign that also employed 2-week integrated passive sampler detectors (PSD) for NO, Ozone, and nine volatile organic compounds at 43 intersections distributed across the entire city of Baltimore, MD. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2016.03.001DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4827705PMC
May 2016
13 Reads

Trends in PM emissions, concentrations and apportionments in Detroit and Chicago.

Atmos Environ (1994) 2016 Mar;129:197-209

Environmental Health Sciences, University of Michigan, Ann Arbor, MI, USA.

PM concentrations throughout much of the U.S. have decreased over the last 15 years, but emissions and concentration trends can vary by location and source type. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2016.01.012DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5603263PMC

Disaggregated NO emission factors in China based on cropping parameters create a robust approach to the IPCC Tier 2 methodology.

Atmos Environ (1994) 2015 Dec;122:272-281

Sustainable Soil & Grassland Systems, Rothamsted Research, North Wyke, Devon, EX20 1NJ, UK.

China accounts for a third of global nitrogen fertilizer consumption. Under an International Panel on Climate Change (IPCC) Tier 2 assessment, emission factors (EFs) are developed for the major crop types using country-specific data. IPCC advises a separate calculation for the direct nitrous oxide (NO) emissions of rice cultivation from that of cropland and the consideration of the water regime used for irrigation. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S13522310153039
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http://dx.doi.org/10.1016/j.atmosenv.2015.09.054DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4705909PMC
December 2015
3 Reads

Volatile organic compound conversion by ozone, hydroxyl radicals, and nitrate radicals in residential indoor air: Magnitudes and impacts of oxidant sources.

Atmos Environ (1994) 2015 Apr;106:382-391

Exposure Assessment Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, WV 26505, United States.

Indoor chemistry may be initiated by reactions of ozone (O), the hydroxyl radical (OH), or the nitrate radical (NO) with volatile organic compounds (VOC). The principal indoor source of O is air exchange, while OH and NO formation are considered as primarily from O reactions with alkenes and nitrogen dioxide (NO), respectively. Herein, we used time-averaged models for residences to predict O, OH, and NO concentrations and their impacts on conversion of typical residential VOC profiles, within a Monte Carlo framework that varied inputs probabilistically. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2014.06.062DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4741105PMC

Dimethylamine as a major alkyl amine species in particles and cloud water: Observations in semi-arid and coastal regions.

Atmos Environ (1994) 2015 Dec;122:250-258

Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA; Department of Atmospheric Sciences, University of Arizona, Tucson, AZ, USA; Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ, USA.

Aerosol and cloud water measurements of dimethylamine (DMA), the most abundant amine in this study, were conducted in semi-arid (Tucson, Arizona) and marine (Nucleation in California Experiment, NiCE; central coast of California) areas. In both regions, DMA exhibits a unimodal aerosol mass size distribution with a dominant peak between 0.18 and 0. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2015.09.061DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4719122PMC
December 2015

Estimating daily PM and PM across the complex geo-climate region of Israel using MAIAC satellite-based AOD data.

Atmos Environ (1994) 2015 Dec 8;122:409-416. Epub 2015 Oct 8.

Civil and Environmental Engineering, Technion, Haifa, Israel.

Estimates of exposure to PM are often derived from geographic characteristics based on land-use regression or from a limited number of fixed ground monitors. Remote sensing advances have integrated these approaches with satellite-based measures of aerosol optical depth (AOD), which is spatially and temporally resolved, allowing greater coverage for PM estimations. Israel is situated in a complex geo-climatic region with contrasting geographic and weather patterns, including both dark and bright surfaces within a relatively small area. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S13522310153042
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http://dx.doi.org/10.1016/j.atmosenv.2015.10.004DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5621656PMC
December 2015
34 Reads

Atmospheric dispersion of PCB from a contaminated Lake Michigan harbor.

Atmos Environ (1994) 2015 Dec;122:791-798

Department of Civil & Environmental Engineering, IIHR-Hydroscience and Engineering, The University of Iowa, Iowa City, IA, USA.

Indiana Harbor and Ship Canal (IHSC) in East Chicago is an industrial waterway on Lake Michigan and a source of PCBs to Lake Michigan and the overlying air. We hypothesized that IHSC is an important source of airborne PCBs to surrounding communities. We used AERMOD to model hourly PCB concentrations, utilizing emission fluxes from a prior study and hourly meteorology provided by the State of Indiana. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2015.10.040DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4649934PMC
December 2015
4 Reads

Pulmonary inflammatory effects of source-oriented particulate matter from California's San Joaquin Valley.

Atmos Environ (1994) 2015 Oct;119:174-181

Center for Health and the Environment, University of California, Davis, One Shields Avenue, Davis, California, 95616 USA.

The EPA regulates ambient particulate matter (PM) because substantial associations have been established between PM and health impacts. Presently, regulatory compliance involves broad control of PM emission sources based on mass concentration rather than chemical composition, although PM toxicity is likely to vary depending upon PM physicochemical properties. The overall objective of this study was to help inform source-specific PM emission control regulations. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2015.08.043DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4639935PMC
October 2015
1 Read