Oxides of Nitrogen, Oxides of Sulfur, and Particulate Matter Policy Assessment for the Secondary National Ambient Air Quality Standards (NAAQS)


Under the Clean Air Act, EPA is required to carry out a periodic review and revision, as appropriate, of the air quality criteria and the primary and secondary standards for six criteria air pollutants. EPA is currently reviewing the Secondary National Ambient Air Quality Standards (NAAQS) for oxides of nitrogen, oxides of sulfur, and particulate matter. Secondary standards set limits to protect public welfare, including protection against decreased visibility, damage to animals, crops, vegetation, and buildings. As part of EPA's review, they have developed a draft Policy Assessment and are requesting that CASAC peer review the draft assessment.

On this page:

See EPA’s PDF page to learn more about PDF files.


Panel Formation

Nominations of Experts:


Public Meetings and/or Teleconferences

Meeting DateTitle
09/05/2023 to 09/06/2023Chartered CASAC and CASAC NOx/SOx/PM Panel Meeting
06/28/2023 to 06/29/2023CASAC NOx/SOx/PM Secondary NAAQS Panel PA Meeting
05/31/2023 to 05/31/2023CASAC NOx/SOx/PM Secondary NAAQS Panel PA Briefing

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