Approval and Disapproval of California Air Plan; San Joaquin Valley Serious Area Plan and Attainment Date Extension for the 1997 PM2.5

The Environmental Protection Agency (EPA) is proposing to approve, conditionally approve, and disapprove state implementation plan (SIP) revisions submitted by California to address Clean Air Act (CAA or Act) requirements for the 1997 24-hour and annual fine particulate matter (PM2.5) national ambient air quality standards (NAAQS) in the San Joaquin Valley (SJV) Serious PM2.5 nonattainment area. As part of this action, the EPA is proposing to grant extensions of the Serious area attainment dates for the 1997 24-hour and annual PM2.5 NAAQS in the SJV to December 31, 2018 and December 31, 2020, respectively, based on a conclusion that the State has satisfied the statutory criteria for these extensions of the Serious area attainment date. The EPA is also proposing to approve inter-pollutant trading ratios for use in transportation conformity analyses.