521 results match your criteria Atmospheric Environment[Journal]


Ensemble averaging based assessment of spatiotemporal variations in ambient PM concentrations over Delhi, India, during 2010-2016.

Atmos Environ (1994) 2020 Mar 27;224. Epub 2020 Jan 27.

Harvard School of Public Health, Boston, USA.

Elevated levels of ambient air pollution has been implicated as a major risk factor for morbidities and premature mortality in India, with particularly high concentrations of particulate matter in the Indo-Gangetic plain. High resolution spatiotemporal estimates of such exposures are critical to assess health effects at an individual level. This article retrospectively assesses daily average PM exposure at 1 km × 1 km grids in Delhi, India from 2010-2016, using multiple data sources and ensemble averaging approaches. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2020.117309DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7219795PMC

Workflow for Comparison of Chemical and Biological Metrics of Filter Collected PM.

Atmos Environ (1994) 2020 Apr 5;226. Epub 2020 Mar 5.

Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, 97331.

There is limited understanding of adverse health effect associations with chemical constituents of fine particulate matter (PM) as well as the underlying mechanisms. We outlined a workflow to assess metrics, beyond concentration, using household and personal PM filter samples collected in India as a proof of concept for future large-scale studies. Oxidative potential, chemical composition (polycyclic aromatic hydrocarbons and elements), and bioactivity (developmental exposures in zebrafish) were determined. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2020.117379DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7170255PMC

Excitation Emission Matrix Fluorescence Spectroscopy for Combustion Generated Particulate Matter Source Identification.

Atmos Environ (1994) 2020 Jan 22;220. Epub 2019 Oct 22.

Department of Chemical Engineering, Critical Care and Sleep Medicine University of Washington.

The inhalation of particulate matter (PM) is a significant health risk associated with reduced life expectancy due to increased cardio-pulmonary disease and exacerbation of respiratory diseases such as asthma and pneumonia. PM originates from natural and anthropogenic sources including combustion engines, cigarettes, agricultural burning, and forest fires. Identifying the source of PM can inform effective mitigation strategies and policies, but this is difficult to do using current techniques. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2019.117065DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7111209PMC
January 2020

Near-road Vehicle Emissions Air Quality Monitoring for Exposure Modeling.

Atmos Environ (1994) 2020 Mar 31;224. Epub 2020 Jan 31.

School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, USA.

Exposure to vehicular emissions has been linked to numerous adverse health effects. In response to the arising concerns, near-road monitoring is conducted to better characterize the impact of mobile source emissions on air quality and exposure in the near-road environment. An intensive measurement campaign measured traffic-related air pollutants (TRAPs) and related data (e. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2020.117318DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7080188PMC

Analysis of black carbon on filters by image-based reflectance.

Atmos Environ (1994) 2020 Feb 20;223. Epub 2020 Jan 20.

School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, V6T1Z3, Canada.

Black carbon (BC) is an important contributor to global particulate matter emissions. BC is associated with adverse health effects, and an important short-lived climate pollutant. Here, we describe a low cost method of analysis that utilizes images of PTFE filters taken with a digital camera to estimate BC content on filters. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2020.117300DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7039653PMC
February 2020

Characterizing population exposure to coal emissions sources in the United States using the HyADS model.

Atmos Environ (1994) 2019 Apr 2;203:271-280. Epub 2019 Feb 2.

Department of Statistics and Data Sciences and Department of Women's Health, University of Texas at Austin and Dell Medical School, Austin, TX.

In anticipation of the expanding appreciation for air quality models in health outcomes studies, we develop and evaluate a reduced-complexity model for pollution transport that intentionally sacrifices some of the sophistication of full-scale chemical transport models in order to support applicability to a wider range of health studies. Specifically, we introduce the HYSPLIT average dispersion model, HyADS, which combines the HYSPLIT trajectory dispersion model with modern advances in parallel computing to estimate ZIP code level exposure to emissions from individual coal-powered electricity generating units in the United States. Importantly, the method is not designed to reproduce ambient concentrations of any particular air pollutant; rather, the primary goal is to characterize each ZIP code's exposure to these coal power plants specifically. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2019.01.043DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6867130PMC

Assessing PM Model Performance for the Conterminous U.S. with Comparison to Model Performance Statistics from 2007-2015.

Atmos Environ (1994) 2019 ;214:1-116872

Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, USA.

Previous studies have proposed that model performance statistics from earlier photochemical grid model (PGM) applications can be used to benchmark performance in new PGM applications. A challenge in implementing this approach is that limited information is available on consistently calculated model performance statistics that vary spatially and temporally over the U.S. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2019.116872DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6859642PMC
January 2019

Time series analysis of wintertime O and NO formation using vector autoregressions.

Atmos Environ (1994) 2019 ;218:1-116988

for submission to Atmospheric Environment Office of Research and Development, United States Environmental Protection Agency, 109 T. W. Alexander Drive, Research Triangle Park, North Carolina 27711, United States.

Concentrations of 11 species are reported from continuous measurements taken during a wintertime field study in Utah. Time series data for measured species generally displayed strong diurnal patterns. Six species show a diurnal pattern of daytime maximums (NO, NO, O, HO, CHO, and Cl), while five species show a diurnal pattern of night time maximums (NO, HONO, ClNO, HNO, and NO). Read More

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http://dx.doi.org/10.1016/j.atmosenv.2019.116988DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6820145PMC
January 2019

Predicting Indoor Concentrations of Black Carbon in Residential Environments.

Atmos Environ (1994) 2019 Mar 9;201:223-230. Epub 2019 Jan 9.

Department of Environmental Health, University of Cincinnati,160 Panzeca Way, Kettering Laboratory, Cincinnati, Ohio USA 45267.

Black carbon (BC) is a descriptive term that refers to light-absorbing particulate matter (PM) produced by incomplete combustion and is often used as a surrogate for traffic-related air pollution. Exposure to BC has been linked to adverse health effects. Penetration of ambient BC is typically the primary source of indoor BC in the developed world. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2018.12.053DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6785191PMC
March 2019
4 Reads

α-Pinene-Derived Organic Coatings on Acidic Sulfate Aerosol Impacts Secondary Organic Aerosol Formation from Isoprene in a Box Model.

Atmos Environ (1994) 2019 ;213:456-462

Department of Environmental Science and Engineering, Gillings School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 United States.

Fine particulate matter (PM) is known to have an adverse impact on public health and is an important climate forcer. Secondary organic aerosol (SOA) contributes up to 80% of PM worldwide and multiphase reactions are an important pathway to form SOA. Aerosol-phase state is thought to influence the reactive uptake of gas-phase precursors to aerosol particles by altering diffusion rates within particles. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2019.06.005DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6638570PMC
January 2019
1 Read

Influence of bromine and iodine chemistry on annual, seasonal, diurnal, and background ozone: CMAQ simulations over the Northern Hemisphere.

Atmos Environ (1994) 2019 ;213:395-404

Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid 28006, Spain.

Bromine and iodine chemistry has been updated in the Community Multiscale Air Quality (CMAQ) model to better capture the influence of natural emissions from the oceans on ozone concentrations. Annual simulations were performed using the hemispheric CMAQ model without and with bromine and iodine chemistry. Model results over the Northern Hemisphere show that including bromine and iodine chemistry in CMAQ not only reduces ozone concentrations within the marine boundary layer but also aloft and inland. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2019.06.020DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6638568PMC
January 2019
4 Reads

A New Method for Assessing the Efficacy of Emission Control Strategies.

Atmos Environ (1994) 2019 ;199:233-243

University of Connecticut, Department of Civil and Environmental Engineering, Storrs-Mansfield, CT, USA.

Regional-scale air quality models and observations at routine air quality monitoring sites are used to determine attainment/non-attainment of the ozone air quality standard in the United States. In current regulatory applications, a regional-scale air quality model is applied for a base year and a future year with reduced emissions using the same meteorological conditions as those in the base year. Because of the stochastic nature of the atmosphere, the same meteorological conditions would not prevail in the future year. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2018.11.010DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6605770PMC
January 2019

Parameterization of heterogeneous reaction of SO to sulfate on dust with coexistence of NH and NO under different humidity conditions.

Atmos Environ (1994) 2019 Jul;208:133-140

State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.

Sulfate plays an important role in atmospheric haze in China, which has received considerable attention in recent years. Various types of parameterization methods and heterogeneous oxidation rates of SO have been used in previous studies. However, properly representing heterogeneous sulfate formation in air quality models remains a big challenge. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2019.04.004DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6559380PMC
July 2019
12 Reads

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
9 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
28 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
June 2018
6 Reads

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
2 Reads

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
3 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
31 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
3 Reads

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
April 2018
1 Read

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
1 Read

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
24 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
5 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
4 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
Publisher Site
http://dx.doi.org/10.1016/j.atmosenv.2017.06.047DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5949884PMC
September 2017
9 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
http://dx.doi.org/10.1016/j.atmosenv.2018.01.052DOI Listing
April 2018
4 Reads

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
2 Reads

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
22 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
http://dx.doi.org/10.1016/j.atmosenv.2017.08.065DOI Listing
November 2017
9 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
2 Reads

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
June 2017
2 Reads

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
http://dx.doi.org/10.1016/j.atmosenv.2017.06.027DOI Listing
September 2017
3 Reads

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
1 Read

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
9 Reads

Modeling Dispersion of Emissions from Depressed Roadways.

Atmos Environ (1994) 2018 ;186:189-197

Department of Mechanical Engineering, University of California, Riverside, CA 92521, USA.

This paper presents an analysis of data from a wind tunnel (Heist et al., 2009) conducted to study dispersion of emissions from three depressed roadway configurations; a 6 m deep depressed roadway with vertical sidewalls, a 6 m deep depressed roadway with 30° sloping sidewalls, and a 9 m deep depressed roadway with vertical sidewalls. The width of the road at the bottom of the depression is 36 m for all cases. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2018.04.058DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6750714PMC
January 2018

Influence of uncertainties in burned area estimates on modeled wildland fire PM and ozone pollution in the contiguous U.S.

Atmos Environ (1994) 2018 ;191:328-339

CSRA, Research Triangle Park, North Carolina, USA.

Wildland fires are a major source of fine particulate matter (PM), one of the most harmful ambient pollutants for human health globally. To represent the influence of wildland fire emissions on atmospheric composition, regional and global chemical transport models rely on emission inventories developed from estimates of burned area (i.e. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2018.08.020DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6476193PMC
January 2018
1 Read

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
17 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
1 Read

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
12 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
11 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
67 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
4 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
5 Reads
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
4 Reads

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
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http://dx.doi.org/10.1016/j.atmosenv.2017.01.029DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6223182PMC
April 2017
16 Reads

Ambient Air Quality Measurements from a Continuously Moving Mobile Platform: Estimation of Area-Wide, Fuel-Based, Mobile Source Emission Factors Using Absolute Principal Component Scores.

Atmos Environ (1994) 2017 Mar 21;152:201-211. Epub 2016 Dec 21.

University of Washington, Department of Environmental and Occupational Health Sciences, Box 357234, Seattle, WA 98195-7234, USA.

We have applied the absolute principal component scores (APCS) receptor model to on-road, background-adjusted measurements of NOx, CO, CO, black carbon (BC), and particle number (PN) obtained from a continuously moving platform deployed over nine afternoon sampling periods in Seattle, WA. Two Varimax-rotated principal component features described 75% of the overall variance of the observations. A heavy-duty vehicle feature was correlated with black carbon and particle number, whereas a light-duty feature was correlated with CO and CO. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2016.12.037DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7059631PMC

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
2 Reads

Reduction of air pollution levels downwind of a road with an upwind noise barrier.

Atmos Environ (1994) 2017 ;155:137-10

University of California, Riverside, CA 92521, USA.

We propose a dispersion model to estimate the impact of a solid noise barrier upwind of a highway on air pollution concentrations downwind of the road. The model, based on data from wind tunnel experiments conducted by Heist et al. (2009), assumes that the upwind barrier has two main effects: 1) it creates a recirculation zone behind the barrier that sweeps the emissions from the highway back towards the wall, and 2) it enhances vertical dispersion and initial mixing. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.02.001DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6800722PMC
January 2017

Persistence of initial conditions in continental scale air quality simulations.

Atmos Environ (1994) 2017 1;160:36-45. Epub 2017 Jul 1.

Computational Exposure Division, National Exposure Research Laboratory, U.S. Environmental Protection Agency (EPA), Research Triangle Park, NC 27711, USA.

This study investigates the effect of initial conditions (IC) for pollutant concentrations in the atmosphere and soil on simulated air quality for two continental-scale Community Multiscale Air Quality (CMAQ) model applications. One of these applications was performed for springtime and the second for summertime. Results show that a spin-up period of ten days commonly used in regional-scale applications may not be sufficient to reduce the effects of initial conditions to less than 1% of seasonally-averaged surface ozone concentrations everywhere while 20 days were found to be sufficient for the entire domain for the spring case and almost the entire domain for the summer case. Read More

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http://dx.doi.org/10.1016/j.atmosenv.2017.04.009DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6687301PMC