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

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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.