Review of the Ozone National Ambient Air Quality Standards (Final)
Jan. 4, 2021
Based on the Environmental Protection Agency's (EPA's) review of the air quality criteria and the national ambient air quality standards (NAAQS) for photochemical oxidants including ozone (O3), the EPA is retaining the current standards, without revision. This final action is effective 31 December 2020. POC is Dr. Deirdre Murphy, Health and Environmental Impacts Division, Office of Air Quality Planning and Standards, EPA, Mail Code C504-06, Research Triangle Park, NC 27711; tele: (919) 541-0729; email: firstname.lastname@example.org.
(Federal Register 31 December 2020 [Rule] Pages 87256-87351).