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Review of the Primary National Ambient Air Quality Standards for Nitrogen Dioxide: Risk and Exposure Assessment Planning Document
Citation:
Review of the Primary National Ambient Air Quality Standards for Nitrogen Dioxide: Risk and Exposure Assessment Planning Document.
Impact/Purpose:
Provide opportunity for CASAC feedback on EPA's plans for the risk and exposure assessment for the Nitrogen Oxides NAAQS review
Description:
The U.S. Environmental Protection Agency (EPA) is conducting a review of the air quality criteria and the primary (health-based) national ambient air quality standards (NAAQS) for nitrogen dioxide (NO2). 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, EPA staff has considered the extent to which updated quantitative analyses of NO2 exposures and/or NO2-attributable health risks are warranted in the current review, based on the available scientific evidence and technical information. These considerations focus on 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 updated quantitative analyses in the current review of the primary NO2 NAAQS.