A hybrid approach to predict daily NO concentrations at city block scale.

Estimating the ambient concentration of nitrogen dioxide (NO) is challenging because NO generated by local fossil fuel combustion varies greatly in concentration across space and time. This study demonstrates an integrated hybrid approach combining dispersion modeling and land use regression (LUR) to predict daily NO concentrations at a high spatial resolution (e.g.

Chemical transport model simulations of organic aerosol in southern California: model evaluation and gasoline and diesel source contributions.

Gasoline- and diesel-fueled engines are ubiquitous sources of air pollution in urban environments. They emit both primary particulate matter and precursor gases that react to form secondary particulate matter in the atmosphere. In this work, we updated the organic aerosol module and organic emissions inventory of a three-dimensional chemical transport model, the Community Multiscale Air Quality Model (CMAQ), using recent, experimentally derived inputs and parameterizations for mobile sources.

Assessing Model Characterization of Single Source Secondary Pollutant Impacts Using 2013 SENEX Field Study Measurements.

Aircraft measurements made downwind from specific coal fired power plants during the 2013 Southeast Nexus field campaign provide a unique opportunity to evaluate single source photochemical model predictions of both O and secondary PM species. The model did well at predicting downwind plume placement. The model shows similar patterns of an increasing fraction of PM sulfate ion to the sum of SO and PM sulfate ion by distance from the source compared with ambient based estimates.

Semivolatile POA and parameterized total combustion SOA in CMAQv5.2: impacts on source strength and partitioning.

Mounting evidence from field and laboratory observations coupled with atmospheric model analyses shows that primary combustion emissions of organic compounds dynamically partition between the vapor and particulate phases, especially as near-source emissions dilute and cool to ambient conditions. The most recent version of the Community Multiscale Air Quality model version 5.2 (CMAQv5.

Estimating State-Specific Contributions to PM2.5- and O3-Related Health Burden from Residential Combustion and Electricity Generating Unit Emissions in the United States.

Background: Residential combustion (RC) and electricity generating unit (EGU) emissions adversely impact air quality and human health by increasing ambient concentrations of fine particulate matter (PM) and ozone (O). Studies to date have not isolated contributing emissions by state of origin (source-state), which is necessary for policy makers to determine efficient strategies to decrease health impacts.

Objectives: In this study, we aimed to estimate health impacts (premature mortalities) attributable to PM and O from RC and EGU emissions by precursor species, source sector, and source-state in the continental United States for 2005.

Current and future particulate-matter-related mortality risks in the United States from aviation emissions during landing and takeoff.

Demand for air travel is projected to increase in the upcoming years, with a corresponding influence on emissions, air quality, and public health. The trajectory of health impacts would be influenced by not just emissions growth, but also changes in nonaviation ambient concentrations that influence secondary fine particulate matter (PM(2.5) ) formation, population growth and aging, and potential shifts in PM(2.