The Environmental Protection Agency (EPA) is taking final action to approve portions of two state implementation plan (SIP) revisions submitted by the State of California to meet Clean Air Act (CAA or ``Act'') requirements for the 2008 8-hour ozone national ambient air quality standards (NAAQS or ``standards'') in the Sacramento Metro ozone nonattainment area (``Sacramento Metro Area'').

The Environmental Protection Agency (EPA) is taking final action to approve a Nevada State Implementation Plan (SIP) revision submitted by the Nevada Department of Environmental Protection (NDEP). On September 27, 2010, the EPA redesignated the Las Vegas Valley area from nonattainment to attainment for the carbon monoxide (CO) national ambient air quality standard (NAAQS) and approved the State's CO maintenance plan ensuring the area would maintain the NAAQS for ten years through 2020.

The Environmental Protection Agency (EPA) is proposing to approve the State Implementation Plan (SIP) submitted by the State of New Mexico to meet the Emissions Inventory (EI), and Emissions Statement (ES) requirements of the Federal Clean Air Act (CAA or the Act) for the Sunland Park ozone nonattainment area for the 2015 8-hour ozone national ambient air quality standards (NAAQS). EPA is proposing to approve this action pursuant to section 110 and part D of the CAA and EPA's regulations.

The Environmental Protection Agency (EPA) is proposing to approve the ``Indian Wells Valley Second 10-Year PM<INF>10</INF> Maintenance Plan'' (``Indian Wells Second Maintenance Plan'' or ``Plan'') as a revision to the state implementation plan (SIP) for the State of California. The Indian Wells Second Maintenance Plan includes, among other elements, a base year emissions inventory, a maintenance demonstration, contingency provisions, and motor vehicle emissions budgets for use in transportation conformity determinations.