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U.S. EPA. Integrated Science Assessment (ISA) for Ozone and Related Photochemical Oxidants (Final Report, Apr 2020) | ISA: Integrated Science Assessments | Environmental Assessment | US EPA. Washington, DC, 2020. https://cfpub.epa.gov/ncea/isa/recordisplay.cfm?deid=348522 (accessed Oct 22, 2020).