Integrated Science Assessment (ISA) for Ozone and Related Photochemical Oxidants (Final Report)

Notice

EPA's announced the availability of the final Integrated Science Assessment for Ozone and Related Photochemical Oxidants in an April 20, 2020 Federal Register Notice.


Abstract

The Integrated Science Assessment for Ozone and Related Photochemical Oxidants is a concise synthesis and evaluation of the most policy-relevant science, and has been prepared as part of the review of the primary (health-based) and secondary (welfare-based) National Ambient Air Quality Standards (NAAQS) for Ozone and Related Photochemical Oxidants under the Clean Air Act. Welfare effects are non-health effects which, according to the Clean Air Act include, but are not limited to, effects on soils, water, crops, vegetation, animals, wildlife and climate. The Ozone ISA, in conjunction with additional technical and policy assessments, provides the policy relevant scientific information necessary to conduct a review of the current primary and secondary air quality standards for Ozone sufficiently protects public health and welfare.

EPA has established NAAQS for six criteria pollutants. Presently the EPA is reviewing the air quality criteria and NAAQS for photochemical oxidants and ozone; ozone is the current indicator for this NAAQS. Periodically, EPA reviews the scientific basis for these standards by preparing an Integrated Science Assessment (ISA). The ISA, in conjunction with additional technical and policy assessments, provides the policy relevant scientific information necessary to conduct a review of the current NAAQS and the appropriateness of possible alternative standards. These reviews play a significant role in EPA’s commitment to ensuring a clean and healthy environment for the public.

Citation

U.S. EPA. Integrated Science Assessment (ISA) for Ozone and Related Photochemical Oxidants (Final Report). U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-20/012, 2020.

History/Chronology

Jun 2018EPA put out a call for scientific and policy relevant papers in preparation of developing an updated Integrated Review Plan (IRP) and an Integrated Science Assessment (ISA) as part of the 5- year review of the air quality criteria and the National Ambient Air Quality Standards (NAAQS) this one specific to Ozone (O3) and related photochemical oxidants. [Federal Register Jun 26, 2018]
Oct/Nov 2018EPA held a series of webinar workshops to evaluate initial draft materials for the Integrated Science Assessment for Ozone and Related Photochemical Oxidants on October 29 and 31, 2018, and November 1 and 5, 2018.
Sep 2019EPA released the document Integrated Science Assessment for Ozone and Related Photochemical Oxidants (External Review Draft) (EPA/600/R-19/093) for public review and comment.[Federal Register Sep 26, 2019]
Dec 2019The Clean Air Scientific Advisory Committee (CASAC) convened at a public meeting on February 11-12, 2020 to review the draft Ozone ISA.
Feb 2020EPA's Science Advisory Board (SAB) released the Draft CASAC Review of the EPA’s Integrated Science Assessment for Ozone and Related Photochemical Oxidants (External Review Draft – September 2019).
Apr 2020EPA updated the ISA based on CASAC comments on the draft and released the final report.

This download(s) is distributed solely for the purpose of pre-dissemination peer review under applicable information quality guidelines. It has not been formally disseminated by EPA. It does not represent and should not be construed to represent any Agency determination or policy.