SUPPLEMENTARY INFORMATION:

I. General Information

Written Comments: Submit your comments, identified by Docket ID No. EPA-HQ-OAR-2018-0279, at https://www.regulations.gov (our preferred method), or the other methods identified in the ADDRESSES section. Once submitted, comments cannot be edited or removed from the docket. The EPA may publish any comment received to its public docket. Do not submit to EPA's docket at https://www.regulations.gov any information you consider to be Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Multimedia submissions (audio, video, etc.) must be accompanied by a written comment. The written comment is considered the official comment and should include discussion of all points you wish to make. The EPA will generally not consider comments or comment contents located outside of the primary submission ( i.e., on the web, cloud, or other file sharing system). For additional submission methods, the full EPA public comment policy, information about CBI or multimedia submissions, and general guidance on making effective comments, please visit https://www.epa.gov/​dockets/​commenting-epa-dockets.

Due to public health concerns related to COVID-19, the EPA Docket Center and Reading Room are open to the public by appointment only. Our Docket Center staff also continues to provide remote customer service via email, phone, and webform. Hand deliveries or couriers will be received by scheduled appointment only. For further information and updates on EPA Docket Center services, please visit us online at https://www.epa.gov/​dockets.

The EPA continues to monitor information carefully and continuously from the Centers for Disease Control and Prevention (CDC), local area health departments, and our Federal partners so that we can respond rapidly as conditions change regarding COVID-19.

II. Information About the Documents

Two sections of the Clean Air Act (CAA or the Act) govern the establishment and revision of the NAAQS. Section 108 directs the Administrator to identify and list certain air pollutants and then issue “air quality criteria” for those pollutants. The air quality criteria are to “accurately reflect the latest scientific knowledge useful in indicating the kind and extent of all identifiable effects on public health or welfare which may be expected from the presence of such pollutant in the ambient air . . .” (CAA section 108(a)(2)). Under section 109 of the Act, the EPA is then to establish primary (health-based) and secondary (welfare-based) NAAQS for each pollutant for which the EPA has issued air quality criteria. Section 109(d)(1) of the Act requires periodic review and, if appropriate, revision of existing air quality criteria. Revised air quality criteria are to reflect advances in scientific knowledge on the effects of the pollutant on public health and welfare. Under the same provision, the EPA is also to periodically review and, if appropriate, revise the NAAQS, based on the revised air quality criteria.

The Act additionally requires appointment of an independent scientific review committee that is to periodically review the existing air quality criteria and NAAQS and to recommend any new standards and revisions of existing criteria and standards as may be appropriate (CAA section 109(d)(2)(A)-(B)). Since the early 1980s, the requirement for an independent scientific review committee has been fulfilled by the Clean Air Scientific Advisory Committee (CASAC).

In December 2020, the EPA announced its decision to retain the primary and secondary O₃ standards, without revision (85 FR 87256, December 31, 2020). On October 29, 2021, the Agency announced its decision to reconsider the 2020 O₃ NAAQS final action.^[1] In its announcement of the reconsideration, the Agency explained that it would reconsider the 2020 decision to retain 2015 standards based on the existing scientific record. In support of the reconsideration, the EPA is developing an updated PA. The PA, when final, serves to “bridge the gap” between the scientific and technical information in the 2020 ISA and any air quality, exposure and risk analyses available in the reconsideration, and the judgements required of the Administrator. The draft PA builds upon the information presented in the 2020 ISA, the 2020 PA and additional analyses that informed the 2020 decision. The draft PA document will be available on or about April 28, 2022, on the EPA's website at https://www.epa.gov/​naaqs/​ozone-o3-air-quality-standards. The EPA is soliciting advice and recommendations from the CASAC by means of a review of this draft document in an upcoming public meeting of the CASAC. Information about this public meeting, including the dates and location, was published as a separate notice in the Federal Register on April 4, 2022 (87 FR 19501). Following the CASAC meeting, the EPA will consider comments received from the CASAC and the public in preparing the final PA.

The draft document briefly described above does not represent and should not be construed to represent any final EPA policy, viewpoint, or determination. The EPA will consider any public comments submitted in response to this notice when revising the document.

87 FR 25485