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.

EPA delayed the effective dates for the final rules titled "National Emission Standards for Hazardous Air Pollutants for Major Sources: Industrial, Commercial, and Institutional Boilers and Process Heaters" and "Standards of Performance for New Sources and Emission Guidelines for Existing Sources: Commercial and Industrial Solid Waste Incineration Units" until judicial review and Agency reconsideration are completed.

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.

EPA proposed to amend the new source performance standards for electric utility and industrial-commercial-institutional steam-generating units; see above for direct final rule.

EPA proposed to amend NESHAPs for the Portland cement manufacturing industry and the standards of performance for Portland cement plants; see above for direct final rule.

EPA proposed to update a portion of the outer continental shelf air regulations for California.