Release of Draft Integrated Science Assessment To Support the Review of the Primary National Ambient Air Quality Standards for Oxides of Nitrogen

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Environmental Protection Agency [EPA-HQ-OAR-2023-0317; FRL-11157-04-OAR] AGENCY: Environmental Protection Agency (EPA). ACTION: Notice of availability. SUMMARY: The U.S. Environmental Protection Agency (EPA) is making available for public review the draft document titled, Integrated Science Assessment for Oxides of Nitrogen—Health Criteria, External Review Draft (“draft ISA”). This document was prepared as part of the current review of the primary (health-based) national ambient air quality standards (NAAQS) for oxides of nitrogen. The draft ISA will be available on or about July 15, 2026. DATES: Comments must be received on or before September 15, 2026. ADDRESSES: You may send comments on this document, identified by Docket ID No. EPA-HQ-OAR-2023-0317, by any of the following methods: Federal eRulemaking Portal: https://www.regulations.gov (our preferred method). Follow the online instructions for submitting comments. Email: a-and-r-Docket@epa.gov . Include Docket ID No. EPA-HQ-OAR- ( printed page 44842) 2023-0317 in the subject line of the message. Mail: U.S. Environmental Protection Agency, EPA Docket Center, Office of Air and Radiation Docket, Mail Code 28221T, 1200 Pennsylvania Avenue NW, Washington, DC 20460. Hand Delivery or Courier: EPA Docket Center, WJC West Building, Room 3334, 1301 Constitution Avenue NW, Washington, DC 20004. The Docket Center's hours of operation are 8:30 a.m.-4:30 p.m., Monday-Friday (except Federal Holidays). Instructions: Al…