25 results match your criteria wildfire pah

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Organic matter from the Chicxulub crater exacerbated the K-Pg impact winter.

Proc Natl Acad Sci U S A 2020 10 28;117(41):25327-25334. Epub 2020 Sep 28.

Department of Geosciences, The Pennsylvania State University, University Park, PA 16802.

An asteroid impact in the Yucatán Peninsula set off a sequence of events that led to the Cretaceous-Paleogene (K-Pg) mass extinction of 76% species, including the nonavian dinosaurs. The impact hit a carbonate platform and released sulfate aerosols and dust into Earth's upper atmosphere, which cooled and darkened the planet-a scenario known as an impact winter. Organic burn markers are observed in K-Pg boundary records globally, but their source is debated. Read More

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October 2020

Rapid Screening of Urinary 1-Hydroxypyrene Glucuronide by Multisegment Injection-Capillary Electrophoresis-Tandem Mass Spectrometry: A High-Throughput Method for Biomonitoring of Recent Smoke Exposures.

Anal Chem 2020 10 22;92(19):13558-13564. Epub 2020 Sep 22.

Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.

Urinary 1-hydroxypyrene (HP) is a widely used biomarker of polycyclic aromatic hydrocarbon exposure relevant for biomonitoring the deleterious health impacts from tobacco smoke and ambient air pollution, as well as the hazards of certain occupations. Conventional methods for urinary HP analysis based on liquid chromatography with native fluorescence detection or tandem mass spectrometry (MS/MS) and gas chromatography-mass spectrometry (GC-MS) are limited by low sample throughput and complicated sample workup protocols that are prone to bias. Herein, we introduce a high throughput method to directly analyze the intact glucuronide conjugate of HP (HP-G) in human urine after a simple acidified ether extraction procedure when using multisegment injection-capillary electrophoresis-tandem mass spectrometry (MSI-CE-MS/MS). Read More

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October 2020

Wildfires effects on organic matter of soils from Caramulo Mountain (Portugal): environmental implications.

Environ Sci Pollut Res Int 2021 Jan 21;28(1):819-831. Epub 2020 Aug 21.

Institute of Earth Sciences, Porto, Portugal.

The investigation about wildfires has demonstrated that research should include studies on the overall assessment of the processes, thus promoting the public awareness about impacts. The aim of this study is to assess the changes on the carbon content of soils affected by wildfires in Caramulo Mountain (Portugal) to therefore identify the environmental impacts arisen from those changes. Soils from different parent rocks, affected and non-affected by wildfires, were collected. Read More

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January 2021

Isolating different natural and anthropogenic PAHs in the sediments from the northern Bering-Chukchi margin: Implications for transport processes in a warming Arctic.

Sci Total Environ 2020 Sep 23;736:139608. Epub 2020 May 23.

College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China.

Polycyclic aromatic hydrocarbons (PAHs) have become the dominating burden in the Arctic ecosystems, but their transport pathways and relative importance of different sources in the Arctic remained unclear, and this would be further complicated by climate change. Here we interpreted 27 PAHs in 34 surface sediments from the northern Bering-Chukchi margin. We integrated source apportionment methods (including diagnostic ratios, principal component analysis, hierarchical analysis, and positive matrix factorization (PMF) model) together with geochemistry parameters, which reveal a gradually clear picture of the spatial patterns of different sources. Read More

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September 2020

Indoor versus Outdoor Air Quality during Wildfires.

Environ Sci Technol Lett 2019 Dec 11;6(12):696-701. Epub 2019 Nov 11.

Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, Oregon, 97331, United States of America.

The human behavioral modification recommendations during wildfire events are based on particulate matter and may be confounded by the potential risks of gas-phase pollutants such as polycyclic aromatic hydrocarbons (PAHs). Moreover, the majority of adults spend over 90 percent of their time indoors where there is an increased concern of indoor air quality during wildfire events. We address these timely concerns by evaluating paired indoor and outdoor PAH concentrations in residential locations and their relationship with satellite model-based categorization of wildfire smoke intensity. Read More

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December 2019

Effect of northern boreal forest fires on PAH fluctuations across the arctic.

Environ Pollut 2020 Jun 17;261:114186. Epub 2020 Feb 17.

Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China. Electronic address:

Polycyclic aromatic hydrocarbons (PAHs) are formed by the incomplete combustion of fossil fuels and forest or biomass burning. PAHs undergo long-range atmospheric transport, as evidenced by in situ observations across the Arctic. However, monitored atmospheric concentrations of PAHs indicate that ambient PAH levels in the Arctic do not follow the declining trend of worldwide anthropogenic PAH emissions since the 2000s, suggesting missing sources of PAHs in the Arctic or other places across the Northern Hemisphere. Read More

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Impact of local and regional sources of PAHs on tribal reservation air quality in the U.S. Pacific Northwest.

Sci Total Environ 2020 Mar 5;710:136412. Epub 2020 Jan 5.

Oregon State University Department of Chemistry, Corvallis, OR, United States of America; Oregon State University Department of Environmental and Molecular Toxicology, Corvallis, OR, United States of America. Electronic address:

Atmospheric fine particulate matter (PM) transports polycyclic aromatic hydrocarbons (PAHs) regionally and globally, influencing the air quality of communities around the planet. Concentrations of 130 PAHs extracted from PM, collected on a Native American Tribal Reservation in the Northern Puget Sound region of the American Pacific Northwest, were used to assess the air quality impacts of regional and local PAH sources, atmospheric transport, and human health implications. Wind coming from the southeast of the sampling locations increased the overall PAH concentration of the PM, while winds from the southwest decreased the PAH concentration. Read More

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Geochemical Evidence for the Control of Fire by Middle Palaeolithic Hominins.

Sci Rep 2019 10 25;9(1):15368. Epub 2019 Oct 25.

Department of Anthropology, University of Connecticut, Storrs, CT, USA.

The use of fire played an important role in the social and technological development of the genus Homo. Most archaeologists agree that this was a multi-stage process, beginning with the exploitation of natural fires and ending with the ability to create fire from scratch. Some have argued that in the Middle Palaeolithic (MP) hominin fire use was limited by the availability of fire in the landscape. Read More

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October 2019

Incident command post exposure to polycyclic aromatic hydrocarbons and particulate matter during a wildfire.

J Occup Environ Hyg 2019 11 23;16(11):735-744. Epub 2019 Sep 23.

Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, Berkeley, CA.

Wildland firefighters engaged in fire suppression activities are often exposed to hazardous air pollutants such as polycyclic aromatic hydrocarbons (PAHs) and particulate matter (PM) during wildfires with no respiratory protection. Although the most significant exposures to smoke likely occur on the fireline, wildland firefighters may also be exposed at the incident command post (ICP), an area designated for wildfire suppression support operations. Our objective was to characterize exposures of PAHs and PM near an ICP during a wildfire event in California. Read More

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November 2019

Urinary hydroxypyrene determination for biomonitoring of firefighters deployed at the Fort McMurray wildfire: an inter-laboratory method comparison.

Anal Bioanal Chem 2019 Mar 25;411(7):1397-1407. Epub 2019 Jan 25.

Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.

Urinary 1-hydroxypyrene (OH-Pyr) is widely used for biomonitoring human exposures to polycyclic aromatic hydrocarbons (PAHs) from air pollution and tobacco smoke. However, there have been few rigorous validation studies reported to ensure reliable OH-Pyr determination for occupational health and risk assessment. Herein, we report an inter-laboratory method comparison for urinary OH-Pyr when using gas chromatography-high-resolution mass spectrometry (GC-HRMS) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) on urine specimens collected from firefighters (n = 42) deployed at the 2016 Fort McMurray wildfire. Read More

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Grassland fire ecology has roots in the late Miocene.

Proc Natl Acad Sci U S A 2018 11 14;115(48):12130-12135. Epub 2018 Nov 14.

Department of Geosciences, The Pennsylvania State University, University Park, PA 16802.

That fire facilitated the late Miocene C grassland expansion is widely suspected but poorly documented. Fire potentially tied global climate to this profound biosphere transition by serving as a regional-to-local driver of vegetation change. In modern environments, seasonal extremes in moisture amplify the occurrence of fire, disturbing forest ecosystems to create niche space for flammable grasses, which in turn provide fuel for frequent fires. Read More

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November 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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Hydrocarbons in particulate samples from wildfire events in central Portugal in summer 2010.

J Environ Sci (China) 2017 Mar 11;53:122-131. Epub 2016 Jun 11.

Centre for Environmental and Marine Studies (CESAM), Department of Environment, University of Aveiro, 3810-193 Aveiro, Portugal.

In summer 2010, twenty eight (14 PM samples plus 14 samples PM) smoke samples were collected during wildfires that occurred in central Portugal. A portable high-volume sampler was used to perform the sampling, on quartz fibre filters of coarse (PM) and fine (PM) smoke samples. The carbonaceous content (elemental and organic carbon) of particulate matter was analysed by a thermal-optical technique. Read More

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Concentrations, Trends, and Air-Water Exchange of PAHs and PBDEs Derived from Passive Samplers in Lake Superior in 2011.

Environ Sci Technol 2015 Dec 20;49(23):13777-86. Epub 2015 Oct 20.

Graduate School of Oceanography, University of Rhode Island , Narragansett, Rhode Island 02882-1197, United States.

Polycyclic aromatic hydrocarbons (PAHs) and polybrominated diphenylethers (PBDEs) are both currently released into the environment from anthropogenic activity. Both are hence primarily associated with populated or industrial areas, although wildfires can be an important source of PAHs, as well. Polyethylene passive samplers (PEs) were simultaneously deployed in surface water and near surface atmosphere to determine spatial trends and air-water gaseous exchange of 21 PAHs and 11 PBDEs at 19 sites across Lake Superior in 2011. Read More

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December 2015

Coexisting sea-based and land-based sources of contamination by PAHs in the continental shelf sediments of Coatzacoalcos River discharge area (Gulf of Mexico).

Chemosphere 2016 Feb 21;144:591-8. Epub 2015 Sep 21.

Instituto de Investigaciones Marinas y Costeras, Calle 25 No. 2-55, Playa Salguero, Sta Marta, Colombia. Electronic address:

The oldest refinery and the major petrochemical complexes of Mexico are located in the lower reach of the Coatzacoalcos River, considered the most polluted coastal area of Mexico. A (210)Pb-dated sediment core, from the continental shelf of the Coatzacoalcos River, was studied to assess the contamination impact by the oil industry in the southern Gulf of Mexico. The sedimentary record showed the prevalence of petrogenic PAHs between 1950s and 1970s, a period during which waste discharges from the oil industry were not regulated. Read More

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February 2016

Water quality concerns due to forest fires: polycyclic aromatic hydrocarbons (PAH) contamination of groundwater from mountain areas.

J Toxicol Environ Health A 2014 ;77(14-16):806-15

a National Institute of Health Doutor Ricardo Jorge , R. Alexandre Herculano 321, Porto , Portugal.

Water quality alterations due to forest fires may considerably affect aquatic organisms and water resources. These impacts are cumulative as a result of pollutants mobilized from fires, chemicals used to fight fire, and postfire responses. Few studies have examined postfire transport into water resources of trace elements, including the polycyclic aromatic hydrocarbons (PAH), which are organic pollutants produced during combustion and are considered carcinogenic and harmful to humans. Read More

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September 2014

Global atmospheric emissions of polycyclic aromatic hydrocarbons from 1960 to 2008 and future predictions.

Environ Sci Technol 2013 Jun 31;47(12):6415-24. Epub 2013 May 31.

Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.

Global atmospheric emissions of 16 polycyclic aromatic hydrocarbons (PAHs) from 69 major sources were estimated for a period from 1960 to 2030. Regression models and a technology split method were used to estimate country and time specific emission factors, resulting in a new estimate of PAH emission factor variation among different countries and over time. PAH emissions in 2007 were spatially resolved to 0. Read More

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PAH fluxes to Siskiwit revisted: trends in fluxes and sources of pyrogenic PAH and perylene constrained via radiocarbon analysis.

Environ Sci Technol 2013 May 30;47(10):5066-73. Epub 2013 Apr 30.

School of Geography and Earth Sciences, McMaster Unviersity, General Sciences Building room 306, 1280 Main Street West, Hamilton, Ontario, L8S 4K1, Canada.

Trends in concentrations and radiocarbon content of pyrogenic PAHs and perylene were determined 20 years after a previous study by Mcveety and Hites (1988). Pyrogenic PAH fluxes to sediments were observed to continue to decrease over the period from 1980 to 2000 at this remote site in contrast to observations in more urban areas. Radiocarbon analysis of pyrogenic PAHs showed a 50% decrease in the proportion of pyrogenic PAH derived from fossil fuel combustion over the past 50 years, consistent with decreasing emissions from regional coal-fired power-generating plants. Read More

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Characterization of PM(2.5) collected during broadcast and slash-pile prescribed burns of predominately ponderosa pine forests in northern Arizona.

Atmos Environ (1994) 2011 Apr;45(12):2087-2094

Department of Chemistry and Biochemistry, Northern Arizona University, Flagstaff, AZ 86011.

Prescribed burning, in combination with mechanical thinning, is a successful method for reducing heavy fuel loads from forest floors and thereby lowering the risk of catastrophic wildfire. However, an undesirable consequence of managed fire is the production of fine particulate matter or PM(2.5) (particles ≤2. Read More

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Emission of trace gases and organic components in smoke particles from a wildfire in a mixed-evergreen forest in Portugal.

Sci Total Environ 2011 Mar 31;409(8):1466-75. Epub 2011 Jan 31.

Centre for Environmental and Marine Studies, Department of Environment, University of Aveiro, 3810-193 Aveiro, Portugal.

On May 2009, both the gas and particulate fractions of smoke from a wildfire in Sever do Vouga, central Portugal, were sampled. Total hydrocarbons and carbon oxides (CO(2) and CO) were measured using automatic analysers with flame ionisation and non-dispersive infrared detectors, respectively. Fine (PM(2. Read More

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Using silicone passive samplers to detect polycyclic aromatic hydrocarbons from wildfires in streams and potential acute effects for invertebrate communities.

Water Res 2010 Aug 2;44(15):4590-600. Epub 2010 Jun 2.

School of Applied Sciences, RMIT University, PO Box 71, Bundoora, VIC 3083, Australia.

Silicone rubber passive samplers spiked with 4 deuterated performance reference compounds were deployed for 29-33 days to estimate the concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) in 9 streams in Victoria, Australia, following a wildfire. Silicone rubber strips of 2 thicknesses were used to obtain information on the status of uptake of the chemicals of interest at retrieval. In addition, we monitored the stream macroinvertebrate community for potential effects of PAHs or other fire organics. Read More

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Size distribution and chemical composition of airborne particles in south-eastern Finland during different seasons and wildfire episodes in 2006.

Sci Total Environ 2010 Jan 10;408(3):644-51. Epub 2009 Nov 10.

Finnish Meteorological Institute, Air Quality Research, P.O. Box 503, FI-00101 Helsinki, Finland.

The inorganic main elements, trace elements and PAHs were determined from selected PM(1), PM(2.5) and PM(10) samples collected at the Nordic background station in Virolahti during different seasons and during the wildfire episodes in 2006. Submicron particles are those most harmful to human beings, as they are able to penetrate deep into the human respiratory system and may cause severe health effects. Read More

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January 2010

Release of polycyclic aromatic compounds into a Mediterranean creek (Catalonia, NE Spain) after a forest fire.

Water Res 2007 May 29;41(10):2171-9. Epub 2007 Mar 29.

Department of Ecology, Faculty of Biology, University of Barcelona, Diagonal 645, Barcelona, Spain.

Wildfires produce polycyclic aromatic compounds (PACs), among which polycyclic aromatic hydrocarbons (PAHs) are of environmental concern. After a fire affecting a Mediterranean creek, we studied the distribution and short-term permanence of PACs and of 16 priority PAH pollutants in the aquatic environment. PACs were traced through absorbance and fluorescence emissions and organic carbon concentrations. Read More

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In vitro inflammatory and cytotoxic effects of size-segregated particulate samples collected during long-range transport of wildfire smoke to Helsinki.

Toxicol Appl Pharmacol 2006 Sep 5;215(3):341-53. Epub 2006 May 5.

National Public Health Institute, Department of Environmental Health, PO Box 95, FI-70701 Kuopio, Finland.

The impact of long-range transport (LRT) episodes of wildfire smoke on the inflammogenic and cytotoxic activity of urban air particles was investigated in the mouse RAW 264.7 macrophages. The particles were sampled in four size ranges using a modified Harvard high-volume cascade impactor, and the samples were chemically characterized for identification of different emission sources. Read More

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September 2006

Evolution of the concentrations of polycyclic aromatic hydrocarbons in burnt woodland soils.

Environ Sci Technol 2006 Feb;40(3):759-63

Nutrition and Bromatology Group, Analytical and Food Chemistry Department, Faculty of Food Science and Technology, Ourense Campus, University of Vigo, E-32004 Ourense, Spain.

Little is known of the fate of polycyclic aromatic hydrocarbons (PAHs) in soils under burnt woodland. It is not clear what the behavior of the overlying wood ash layer will be along months. In this study, the levels of eight representative PAHs in the 1-5 cm layer of a periurban woodland soil that had undergone wildfire were compared with those measured in nearby and distant unburnt periurban woodland soils and in a distant unburnt rural woodland soil, and the levels at the burnt site were monitored during some 10 months. Read More

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February 2006
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