Next >>

The R-LINE model, which was released in 2013 as a stand-alone model for roadway-type applications and was based on a set of newly developed dispersion curves, exhibited favorable model performance in a limited set of evaluations. In 2019, the R-LINE model was incorporated as the ...

The resuspension of radioactively contaminated particles in a built environment, such as from urban surfaces like foliage, building exteriors, and roadways, is described empirically by current plume and dosimetry models used for hazard assessment and long-term risk purposes. When...

Despite decades of emission control measuresaimed at improving air quality, Los Angeles (LA) continues toexperience severe ozone pollution during the summertime. Weincorporate cooking volatile organic compound (VOC) emissionsin a chemical transport model and evaluate it against o...

Near-transportation source environments can be impacted by higher concentrations of particulate matter (PM) and other pollutants. Populations living in these environments may experience adverse health effects including cardiovascular and respiratory incidences. While there are ma...

Air pollution exposure is a significant risk factor for morbidity and mortality particularly for those with pre-existing chronic disease. Previous studies have highlighted the risks that long-term particulate matter exposure has for readmissions. However, few studies have evaluat...

Abstract: Background:  Global urbanization is leading to increased exposure to traffic-related air pollution (TRAP), which is associated with adverse health events. While individuals with cardiovascular disease (CVD) are known to have elevated susceptibility to air pollut...

Electrifying on-road trucking is a strategy for decarbonizing the transportation sector. While battery-electric trucks have zero tailpipe emissions, the associated increase in electric sector grid emissions would offset a portion of on-road emission reductions. We utilize a techn...

This paper investigates the feasibility of developingnational empirical models to predict ambient concentrations ofsparsely monitored air pollutants at high spatial resolution. Weused a data set of cooking organic aerosol (COA) andhydrocarbon-like organic aerosol (HOA; traffic pr...

Green-blue-grey infrastructure (GBGI) offers environmental benefits in urban areas, yet its impact on air pollution is under-researched, and the literature fragmented. This review evaluates quantitative studies on GBGI's capability to mitigate air pollution, compares their specif...

EPA’s Office of Research and Development (ORD) devel?oped the stand-alone Gaussian dispersion R-LINE model for roadway applications, including roadway specific com?plexities, such as noise barriers and depressions. This model has since been incorporated into EPA’s pre...

On-road transportation is one of the largest contributors to air pollution in the United States. The COVID-19 pandemic provided the unintended experiment of reduced on-road emissions' impacts on air pollution due to lockdowns across the United States. Studies have quantified on-r...

Liquid asphalt is a petroleum-derived substance commonly used in constructionactivities. Recent work has identified lower volatility, reactive organic carbon from asphalt as an overlooked source of secondary organic aerosol (SOA) precursor emissions. Here, we leverage potential e...

This study describes a modeling framework, model evaluation, and source apportionment to understand the causes of Los Angeles (LA) air pollution. A few major updates are applied to the Community Multiscale Air Quality (CMAQ) model with a high spatial resolution (1 km&thins...

The US Environmental Protection Agency (EPA) estimates on-road vehicles emissions using the Motor Vehicle Emission Simulator (MOVES). We developed updated ammonia emission rates for MOVES based on road-side exhaust emission measurements of light-duty gasoline and heavy-...

Air pollution monitoring using mobile ground-based measurement platforms can provide high-quality spatiotemporal air pollution information. As mobile air quality monitoring campaigns extend to entire fleets of vehicles and integrate smaller-scale air quality sensors, it is import...

The design of emission abatement measures to effectivly reduce high ground-level ozone (O3) concentrations in urban areas is very complex. In addition to the strongly non-linear chemistry of this secondary pollutant, precursors can be released by a variety of sources in different...

Background: Air pollution risk assessments do not generally quantify health impacts using multipollutant risk estimates, but instead use results from single-pollutant or copollutant models. Multipollutant epidemiological models account for pollutant interactions and joint effects...

Background: While benefits of greenness to health have been reported, findings specific to child respiratory health are inconsistent. Methods: We utilized a prospective birth cohort followed from birth to age 7 years (n = 617). Residential surrounding greenness was quan...

Estimating population exposure to particulate matter during wildfires can be difficult because of insufficient monitoring data to capture the spatiotemporal variability of smoke plumes. Chemical transport models (CTMs) and satellite retrievals provide spatiotemporal data that may...

Communities located in near-road environments experience elevated levels of traffic-related air pollution. Near-road air pollution is a major public health concern, and an environmental justice issue. Roadside green infrastructure such as trees, hedges, and bushes may help reduce...

Past work has shown that traffic patterns in the USA and resulting NOx emissions vary by day of week, with NOx emissions typically being higher on weekdays than weekends. This pattern of emissions leads to different levels of ozone on weekends versus weekdays and can be...

As a Nature-Based Solution, roadside green infrastructure (also known as roadside barriers) can potentially mitigate traffic-related air pollution by increasing dispersion and promoting pollutant deposition. For new and existing barriers, the vegetation’s physical and ecolo...

This paper focuses on the impact of solid barriers located upwind of a highway in reducing vehicle related concentrations that occur downwind of the roadway, compared to a highway without barriers. Measurements made in the United States Environmental Protection Agency’s met...

Mobile sources are responsible for a substantial controllable portion of the reactive organic carbon (ROC) emitted to the atmosphere, especially in urban environments of the United States. We update existing methods for calculating mobile source organic particle and vapor emissio...

During the immediate, emergency phase of a response to a radiological dispersal device (RDD), an improvised nuclear device (IND), or accidental radiological release, emergency responders may be exposed to radioactivity due to inhalation and direct contact. It is important to mini...