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  2. Reviewing National Ambient Air Quality Standards (NAAQS)

Nitrogen Dioxide (NO2) Primary Standards - Federal Register Notices from Current Review

Over the course of each NAAQS review, EPA publishes notices in the Federal Register for a variety of activities:  the kick-off workshop and call for information, CASAC meetings, availability of pre-rulemaking documents and opportunities for comment on these documents, as well as proposed and final rulemaking decisions and public hearings on a proposed rulemaking decision.

Rulemaking Notices / Public Hearings

Pre-Rulemaking Documents / Availability and Opportunities for Public Comment

  • Notice of Proposed Consent Decree - August 8, 2024
  • Notice of Availability - Integrated Review Plan for Primary NAAQS for Nitrogen Oxides, Volumes 1 and 2 - March 18, 2024
  • Request for Nominations: CASAC Nitrogen Oxides Panel - November 3, 2023
  • Call for Information on Integrated Science Assessment for Oxides of Nitrogen - Health Criteria (PDF) - Dec 9, 2022

Public Meetings / Workshops

  • Notice of Webinar Workshop to Review Initial Draft Materials for Integrated Science Assessment  - September 10, 2024

You may also be interested in other documents from the current nitrogen dioxide NAAQS review.

Reviewing National Ambient Air Quality Standards (NAAQS)

  • Carbon Monoxide Standards
  • Lead Standards
  • Nitrogen Dioxide Primary Standards
  • Nitrogen Dioxide Secondary Standards
  • Ozone Standards
  • Particulate Matter Standards
  • Sulfur Dioxide Primary Standards
  • Sulfur Dioxide Secondary Standards
Contact Us about Reviewing National Ambient Air Quality Standards (NAAQS)
Contact Us about Reviewing National Ambient Air Quality Standards (NAAQS) to ask a question, provide feedback, or report a problem.
Last updated on September 2, 2025
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