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Review of the Secondary National Ambient Air Quality Standard for Nitrogen Oxides, Sulfur Oxides and Particulate Matter: Risk and Exposure Assessment Planning Document
Citation:
Review of the Secondary National Ambient Air Quality Standard for Nitrogen Oxides, Sulfur Oxides and Particulate Matter: Risk and Exposure Assessment Planning Document.
Impact/Purpose:
Provide opportunity for CASAC feedback on the EPA's plans for the risk and exposure assessment for the review of the secondary NAAQS for nitrogen oxides, sulfur oxides and particulate matter.
Description:
The U.S. Environmental Protection Agency (EPA) is conducting a review of the air quality criteria and the secondary (welfare-based) national ambient air quality standards (NAAQS) for nitrogen oxides (NOx), sulfur oxides (SOx), and particulate matter (PM). The major phases of the process for reviewing NAAQS include the following: (1) planning, (2) science assessment, (3) risk and exposure assessment, and (4) policy assessment. As an initial step in the risk and exposure assessment phase, the EPA’s staff has considered the extent to which quantitative analyses of ecological risks are warranted in the current review, based on the available scientific evidence and technical information. These considerations focus on the availability of new scientific evidence, tools or information and the degree to which important uncertainties identified in quantitative analyses from the last review have been addressed by newly available evidence, tools, or information. The purpose of the REA planning document is to present staff's considerations and preliminary conclusions regarding potential quantitative analyses in the current review of the secondary NOx, SOx and PM NAAQS.
URLs/Downloads:
Peer Review Plan (PDF, NA pp, 38 KB, about PDF)Charge Memo for Secondary NOxSOXPM NAAQS REA Planning Document (PDF, NA pp, 30 KB, about PDF)
Review Draft: REA Plan for Secondary NOxSOXPM NAAQS
CASAC Reivew of NOxSOxPM Secondary NAAQS Risk and Exposure Asses
CASAC Reivew of NOxSxPM Secondary NAAQS Risk and Exposure Asses