Approval and Promulgation of Implementation Plans; California; South Coast Serious Area Plan for the 2006 PM2.5

The Environmental Protection Agency (EPA) is proposing to approve state implementation plan (SIP) revisions submitted by California to address Clean Air Act (CAA or ``Act'') requirements for the 2006 24-hour fine particulate matter (PM2.5) national ambient air quality standards (NAAQS or ``standards'') in the Los Angeles-South Coast air basin (South Coast) Serious PM2.5 nonattainment area. The EPA is also proposing to approve 2017 and 2019 motor vehicle emissions budgets for transportation conformity purposes and inter-pollutant trading ratios for use in transportation conformity analyses.