Partial Approval and Partial Disapproval of Air Quality State Implementation Plans; California; Infrastructure Requirements for Ozone, Fine Particulate Matter (PM2.5), Lead (Pb), Nitrogen Dioxide (NO2), and Sulfur Dioxide (SO2)

The Environmental Protection Agency (EPA) is partially approving and partially disapproving several State Implementation Plan (SIP) revisions submitted by the State of California pursuant to the requirements of the Clean Air Act (CAA or the Act) for the implementation, maintenance, and enforcement of national ambient air quality standards (NAAQS) for ozone, fine particulate patter (PM<INF>2.5</INF>), lead (Pb), nitrogen dioxide (NO<INF>2</INF>), and sulfur dioxide (SO<INF>2</INF>). We refer to such SIP revisions as "infrastructure" SIPs because they are intended to address basic structural SIP requirements for new or revised NAAQS including, but not limited to, legal authority, regulatory structure, resources, permit programs, and monitoring necessary to assure attainment and maintenance of the standards. In addition, we are reclassifying certain regions of the state for emergency episode planning purposes with respect to ozone, NO<INF>2</INF>, SO<INF>2</INF>, and particulate matter (PM). Finally, we are approving into the California SIP several state provisions addressing CAA conflict of interest requirements and an emergency episode planning rule for Great Basin Unified Air Pollution Control District for PM.