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Volatile organic compound (VOC) emissions have negative effects on air quality, human health, and climate. Many VOCs are hazardous air pollutants, or air toxics, that can contribute to deleterious health impacts on affected communities and industrial workplace environments. Fugit...

This presentation describes the continuous formaldehyde (and formic acid) concentration dataset from Westport, Connecticut during the 2018 Long Island Sound Tropospheric Ozone Study, as well as its potential application for constraining volatile organic compound emissions and che...

Biomass smoke emissions can produce acute and chronic health effects including alterations in physiological responses within animal models. Health effects from wildfire biomass smoke emissions are determined by concentration and duration of exposures, but the relationship of con...

Lakes and impoundments are important sources of greenhouse gases (GHG: i.e., CO2, CH4, N2O), yet global emission estimates are based on regionally-biased averages and elementary upscaling. We assembled the largest global dataset to date on emission rates of all three GHGs and fou...

This presentation provides an overview of research on air quality model evaluation being performed at USEPA. The overview is structured according to the model evaluation framework proposed by Dennis et al. (2010). Examples are provided for advances in operational evaluation, diag...

Heart rate assays in wild-type zebrafish embryos have been limited to analysis of one embryo per video/imaging field. Here we present for the first time a platform for high-throughput derivation of heart rate from multiple zebrafish (Danio rerio) embryos per imaging field, which ...

This study demonstrates that both eucalyptus wildfire smoke and a high-carbohydrate meal can cause cardiovascular dysfunction in rats, particularly by disrupting homeostatic controls. When combined the effects appear more severe, however, this phenomenon needs further characteriz...

Summary of near-road air pollution health concerns and mitigation options, with a detailed review of how urban green infrastructure can affect local air quality based on previous EPA research

The U.S. Environmental Protection Agency&rsquo;s (i.e., EPA&rsquo;s or the Agency&rsquo;s) Air and Energy Management Division (AEMD) in the Office of Research and Development&rsquo;s, National Risk Management Research Laboratory (NRMRL) performs advanced methods development, prov...

Globally, billions of people burn fuels indoors for cooking and heating, which contributes to millions of premature deaths and chronic illnesses annually. Additionally, residential burning contributes significantly to black carbon emissions, which are estimated to have the highes...

Conditions within migration corridors that organisms move through can strongly influence their probability of surviving and arriving to their destinations. Diadromous fish populations in the Pacific Northwest face challenges along their migratory routes from declining habitat qua...

Conditions within migration corridors that organisms move through can strongly influence their probability of surviving and arriving to their destinations. Diadromous fish populations in the Pacific Northwest face challenges along their migratory routes from declining habitat qua...

Ozone exposure during implantation receptivity reduces fetal growth during gestation. Intrauterine growth restriction is associated with increased metabolic disease risk as offspring age into adulthood. Therefore, the purpose of this study was to investigate the risk of obesity i...

Building pressure cycling (BPC) is becoming an increasingly important tool for studying vapor intrusion. BPC has been used to distinguish subslab and indoor sources of vapor intrusion as well as to define reasonable worst case volatile organic compound mass discharge into a struc...

Active soil-gas sampling has been used as a reconnaissance method in support of soil and groundwater sampling of volatile and biodegradable organic compounds for over 30 years. More recently, soil gas sampling has been used directly to evaluate risk posed by vapor migration from ...

Light-absorbing organic carbon (OC), also referred to as “brown carbon” (BrC), has been intensively investigated in biomass burning (BB) impacted atmospheres. However, other BrC sources (e.g., secondary formation) are rarely studied in ambient aerosols. In the current work, forty...

Approximately 50 million people in the United States live within 100 meters of a major transportation facility—freeway, airport, or rail yard. Adverse health impacts have been reported from living in close proximity to major transportation facilities including increased respirat...

Ideally, new electricity generating units will have low capital costs, low fuel costs, minimal environmental impacts, and satisfy demand without concerns of intermittency. When expanding generating capacity, candidate technologies can be evaluated against criteria such as these. ...

Populations that live and work near major transportation sources including freeways/highways, rail yards, and ports can be exposed to higher air pollutant levels and adverse health impacts. Understanding the pollutant concentrations in these environments is of great interest for ...

Measurement of open fires and detonations to determine pollutant emission factors poses significant challenges for instrumentation survival, personnel safety, equipment challenges, sample collection, and data quality. Open fire sources, such as wildland fires, often result in lo...

A compact, containerized gasification system was characterized for air emissions while burning four waste types. A methodology is presented for developing a standardized test waste composition and demonstrated using three military and one civilian waste types. Batch charges of ...

Ammonia (NH3) is the most abundant alkaline component in the atmosphere, is therefore of great importance in the neutralization of atmospheric acids and formation of aerosol particles. Numerous studies have been published investigating the effects of NH3 fluxes on agricultural ec...

An accurate simulation of the absorption properties is key for assessing the radiative effects of aerosol on meteorology and climate. The representation of how chemical species are mixed inside the particles (the mixing state) is one of the major uncertainty factors in the assess...

A computational protocol is employed to glean new insight into the kinetics of several 1,5-hydrogen atom (H) shift reactions subsequent to first- and second-generation OH/O2 additions to isoprene. The M06-2X density functional was initially used with the Nudged Elastic Band (NEB)...

The accuracy of atmospheric chemical mechanisms used in air quality models is critical for robustly predicting the production and decay of air pollutants and developing strategies to reduce concentrations that are above levels harmful to humans and ecosystems. In this study we do...