Our understanding of the processes that control the burden and budget of tropospheric
ozone has changed dramatically over the last 60 years. Models are the key tools used to …

Ozone (O3) is a key air pollutant that is produced from precursor emissions and has adverse
impacts on human health and ecosystems. In the US, the Clean Air Act (CAA) regulates O3 …

Assessment of spatial and temporal variation in the impacts of ozone on human health,
vegetation, and climate requires appropriate metrics. A key component of the Tropospheric …

Quantification of source impacts and contributions is a key element for the design of effective
air pollution control policies. In this study, O 3 source impacts and contributions were …

Increasing wildfire activities in the mountainous western US may present a challenge for the
region to attain a recently revised ozone air quality standard in summer. Using current …

This study analyzes simulated regional-scale ozone burdens both near the surface and aloft,
estimates process contributions to these burdens, and calculates the sensitivity of the …

Mitigation of ambient ozone (O 3) pollution is a great challenge because it depends heavily
on the background O 3 which has been poorly evaluated in many regions, including in …

United States (US) background ozone (O3) is the counterfactual O3 that would exist with
zero US anthropogenic emissions. Estimates of US background O3 typically come from …

Reduced complexity tools that provide a representation of both primarily emitted particulate
matter with an aerodynamic diameter less than 2.5 μm (PM2. 5), secondarily formed PM2. 5 …

California's ambient ozone concentrations have two principal contributions: US background
ozone and enhancements produced from anthropogenic precursor emissions; only the latter …