Air Quality Implementation Plans; California; San Diego County; 2008 and 2015 8-Hour Ozone Nonattainment Area Requirements

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Environmental Protection Agency 40 CFR Part 52 [EPA-R09-OAR-2021-0135; FRL-9538-02-R9] AGENCY: Environmental Protection Agency (EPA). ACTION: Proposed rule. SUMMARY: The Environmental Protection Agency (EPA) is proposing to approve portions of two state implementation plan (SIP) revisions submitted by the State of California to meet Clean Air Act requirements for the 2008 8-hour ozone national ambient air quality standards (NAAQS or “standards”) and the 2015 8-hour ozone NAAQS in the San Diego County ozone nonattainment area (“San Diego County area” or “area”). The first SIP revision, “2020 Plan for Attaining the National Ambient Air Quality Standards for Ozone in San Diego County” (“2020 San Diego County Ozone SIP” or “2020 Plan”), addresses most of the SIP requirements for the area. The second SIP revision, referred to as the “Smog Check Certification,” supplements the motor vehicle inspection and maintenance program portion of the 2020 Plan. The EPA is proposing to approve the 2020 Plan, and the San Diego County portion of the Smog Check Certification, as meeting all the applicable ozone nonattainment area requirements for the 2008 and 2015 8-hour ozone NAAQS addressed by the plan except for the emissions statement requirement that the EPA previously found to have been met and the contingency measure requirements, for which the EPA is deferring action. DATES: Comments must be received on or…