Approval of California Air Plan Revisions, Yolo-Solano Air Quality Management District

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the Yolo-Solano Air Quality Management District (YSAQMD or ``District'') portion of the California State Implementation Plan (SIP). This revision concerns the District's demonstration regarding Reasonably Available Control Technology (RACT) requirements for the 1997 8-hour ozone National Ambient Air Quality Standard (NAAQS). The EPA is also taking final action to approve YSAQMD's negative declarations into the SIP for the 1997 8-hour ozone NAAQS. We are approving local SIP revisions under the Clean Air Act (CAA or the Act).