Release of Risk and Exposure Assessment Plan for the Secondary National Ambient Air Quality Standard for Oxides of Nitrogen, Oxides of Sulfur and Particulate Matter

The Environmental Protection Agency (EPA) is conducting a periodic review of the air quality criteria and the secondary National Ambient Air Quality Standards (NAAQS) for oxides of nitrogen, oxides of sulfur, and particulate matter (PM). On or about August 6, 2018, the EPA will make available for public review the document titled Review of the Secondary National Ambient Air Quality Standards for Oxides of Nitrogen, Oxides of Sulfur and Particulate Matter: Risk and Exposure Assessment Planning Document (REA Planning Document). This plan presents considerations and the proposed approach for conducting quantitative analyses of oxides of nitrogen, oxides of sulfur, and PM exposures and welfare risks in this NAAQS review. This planning document is intended to facilitate consultation with the Clean Air Scientific Advisory Committee (CASAC) and public comment on plans for such quantitative analyses.