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Regulatory Development and Retrospective Review Tracker

Review of the NO2 Primary National Ambient Air Quality Standards (NAAQS)

a.k.a. NO2 NAAQS Review

RIN: 2060-AR57 (What's this?)

Docket No.: Not yet available (What's this?)

Current Phase: Pre-Proposal (What's this?)

The last review of the NO2 primary (health-based) NAAQS was completed in January 2010, with the final decision published in the FR in February 2010. In that decision, EPA added a new 1-hour NO2 standard, with a level of 100 ppb, to the existing annual standard, with a level of 53 ppb. The Clean Air Act establishes a 5-year review cycle for all NAAQS.

EPA is now in the process of conducting the next review of the NO2 primary NAAQS.

NPRM: Published in FR00/0000 (projected)

Potential Effects

Children's Health
This rule is likely to address an adverse impact on childhood lifestages, including prenatal (via exposure to women of childbearing age). The potential adverse impacts are expected to be due to toxicity (i.e., the developing fetus, infants, and/or children are more likely to have an adverse response than adult lifestages).

Participate / Learn More Regulatory Review

Some of EPA's rulemakings undergo regulatory review (What's this?), as prescribed by Executive Order 12866 and coordinated by the Office of Management and Budget (OMB). The following list describes which of this rulemaking's stages have completed review and published in the Federal Register, if any, and provides links to the review documents where available. Consult the "Timeline" section of this Web page for the dates of each review.

  • NPRM - No Information Available.
Citations & Authorities

Code of Federal Regulations (CFR) Citation
40 CFR 50 40 CFR 58

Legal Authority
Clean Air Act Title I


This site provides summaries of priority rulemakings and priority retrospective reviews of existing regulations. We update most of the site at the beginning of each month, though some data is updated more frequently if it is time sensitive. The information on this site is not intended to and does not commit EPA to specific conclusions or actions. For example, after further analysis, EPA may decide the effects of a rule would be different or it may decide to terminate a rulemaking.

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