EPA updated outer continental shelf air regulations for California.

SIP Proposal: Connecticut (new source review PSD program)

EPA finalized amendments to Method 301, Field Validation of Pollutant Measurement Methods From Various Waste Media.

SIP Proposal: Colorado (partial approval of revisions to air pollutant emission notice regulations)

SIP Proposal: Colorado (partial approval of updates)

EPA proposed to allow refiners and laboratories to use an alternative test method for olefin content in gasoline.

SIP Proposal: California (limited approval of VOC revisions for the San Joaquin Valley unified air pollution control district)

SIP Proposal: Alabama (disapproval of interstate transport submission)

EPA deferred on an interim basis the imposition of sanctions associated with the Sacramento Metro area's one-hour ozone nonattainment area.

EPA proposed to determine attainment of the PM NAAQS for the Columbia Falls and Libby nonattainment areas in Montana.