Nitrogen Oxides Integrated Science Assessment (Second External Review Draft) for Primary (Health-based) 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, which include oxides of nitrogen. EPA is currently reviewing the primary (health-based) standard for the Nitrogen Dioxide National Ambient Air Quality Standards (NAAQS).EPA's Office of Research and Development has requested a peer review of the Second External Review Draft of its Integrated Science Assessment for Oxides of Nitrogen & Health Criteria. The CASAC [<a href="">previously reviewed</a>] the first external review draft of the Agency's Integrated Science Assessment .The final Integrated Science Assessment is intended to provide a synthesis and evaluation of science relevent for reviewing and revising the primary (health-based) standard for the Nitrogen Dioxide NAAQS.

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

Agency Review Background URLs

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Panel Formation

Nominations of Experts:


Public Meetings and/or Teleconferences

Meeting DateTitle
08/13/2015 to 08/13/2015Public Teleconference of the Chartered Clean Air Scientific Advisory Committee (CASAC) and the CASAC Oxides of Nitrogen Primary NAAQS Review Panel
06/02/2015 to 06/03/2015CASAC Oxides of Nitrogen Review Panel Meeting

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Agency Response

Agency Response

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