Release of Volumes 1 and 2 of the Integrated Review Plan for the National Ambient Air Quality Standards for Ozone and Related Photochemical Oxidants

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On or about December 20, 2024, the Environmental Protection Agency (EPA) is making available to the public Volumes 1 and 2 of the Integrated Review Plan for the National Ambient Air Quality Standards for Ozone and Related Photochemical Oxidants (IRP). The national ambient air quality standards (NAAQS) from photochemical oxidants are set to protect public health and public welfare from these pollutants in ambient air. Volume 1 of the IRP contains contextual background material for the current review of the air quality criteria and the NAAQS. Volume 2 identifies policy-relevant issues in the review and describes key considerations in the EPA's development of the Integrated Science Assessment (ISA). The ISA provides the scientific basis for the EPA's decisions, in conjunction with additional technical and policy assessments, for the review of the NAAQS, as described in sections 108 and 109 of the Clean Air Act.