The policy assessment (PA) presents a staff analysis of the scientific basis for policy options for consideration by senior EPA management prior to rulemaking. Such an evaluation of policy implications is intended to help ‘‘bridge the gap’’ between the Agency’s scientific assessments, presented in the integrated science assessment (ISA) and risk/exposure assessment (REA), and the judgments required of the EPA Administrator in determining whether it is appropriate to retain or revise the NAAQS.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.
- Policy Assessment for the Review of the O3 NAAQS (PDF)(1048 pp, 21 MB, May 2020, EPA-452/R-20-001 )
- Policy Assessment for the Review of the O3 NAAQS, External Review Draft (PDF)(926 pp, 75 MB, October 2019, EPA-452/P-19-002)