SIP Approval: Ohio (limited maintenance plans for the 1997 eight-hour ozone NAAQS).

SIP Approval: Massachusetts (interstate transport requirements for the 1997 and 2008 ozone NAAQS).

SIP Approval: Virginia (administrative revisions).

SIP Approval: Ohio (maintenance plan for the Dayton-Springfield 1997 ozone maintenance area).

SIP Approval: California (requirements for the Los Angeles-South Coast air basin 1979 one-hour, 1997 eight-hour, and 2008 eight-hour ozone nonattainment area).

SIP Proposal: Indiana (maintenance plans for the 1997 ozone NAAQS).

SIP Approval: Nevada (maintenance plan for the Clark County 1997 eight-hour ozone maintenance area).

SIP Proposal: Ohio (limited maintenance plans for the 1997 eight-hour ozone NAAQS).

SIP Proposal: Indiana (limited maintenance plans for the 1997 eight-hour ozone NAAQS).

EPA approved Wisconsin's request to revise the designation of the Sheboygan County 1997 and 2008 ozone nonattainment area, and made a clean data determination for the Inland Sheboygan County 2008 ozone nonattainment area.