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.

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Rulemaking Notices / Public Hearings

• Review of the Primary National Ambient Air Quality Standards for Oxides of Nitrogen, Final Decision - April 6, 2018
• Review of the Primary National Ambient Air Quality Standards for Oxides of Nitrogen, Proposed Decision - July 26, 2017

Pre-Rulemaking Documents / Availability and Opportunities for Public Comment

• Notice of Availability - Policy Assessment for the Review of the Primary NAAQS for Nitrogen Dioxide- April 14, 2017
• Notice of Availability and Request for Public Comment - Policy Assessment for the Review of the Primary NAAQS for Notrogen Dioxide, External Review Draft (PDF)(2 pp, 212 K, September 22, 2016)
• Notice of Availability – Integrated Science Assessment for Oxides of Nitrogen - Health Criteria, Final - January 28, 2016
• Notice of Availability – Risk and Exposure Assessment Planning Document (PDF)(3 pp, 222 K, May 13, 2015)
• Extension of Public Comment Period – Integrated Science Assessment for Oxides of Nitrogen - Health Criteria, Second External Review Draft (PDF)(1 pg, 192 K, March 20, 2015)
• Notice of Availability and Public Comment Period – Integrated Science Assessment for Oxides of Nitrogen, Second External Review Draft (PDF)(2 pp, 237 K, January 30, 2015)
• Notice of Availability – Final Integrated Review Plan for the Primary National Ambient Air Quality Standards for Oxides of Nitrogen (PDF)(2 pp, 216 K, June 30, 2014)
• Notice of Availability and Public Comment Period - Integrated Review Plan for the Primary NAAQS for Oxides of Nitrogen, Draft (PDF)(2 pp, 215 K, February 6, 2014)
• Notice of Availability and Public Comment Period - Integrated Science Assessment for Nitrogen Oxides - Health Criteria, First External Review Draft (PDF)(2 pp, 217 K, November 22, 2013)
• Notice of Availability - Draft Plan for the Integrated Science Assessment for Nitrogen Oxides - Health Criteria (PDF)(2 pp, 238 K, May 3, 2013)
• Notice of Workshop to Inform EPA's Review of the Primary Ntirogen Dioxide NAAQS and Call for Information on Integrated Science Assessment for Oxides of Nitrogen - Health Criteria (PDF)(3 pp, 159 K, February 12, 2012)

Public Meetings / Workshops

• Notice of CASAC Public Teleconference on August 13, 2015 - July 21, 2015
• Notice of CASAC Public Meeting on June 2-3, 2015 - April 24, 2015
• Notification of CASAC Teleconference on May 7, 2014 (PDF)(2 pp, 213 K, March 3, 2014)
• Notice of CASAC meeting on March 12-13, 2014 (PDF)(2 pp, 200 K, February 13, 2014)
• Notice of Workshop on June 11, 2013 to Review Preliminary Draft Materials for Integrated Science Assessment (PDF)(2 pp, 195 K, May 10, 2013)
• Notice of CASAC Teleconference on June 5, 2013 (PDF)(2 pp, 237 K, May 9, 2013)
• Notice of Workshop to Inform EPA's Review of the Primary NO2 NAAQS February 29 - March 1, 2012, and Call for Information on Integrated Science Assessment for Oxides of Nitrogen - Health Criteria (PDF)(3 pp, 159 K, February 10, 2012)

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