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State implementation plans (SIPs)

Texas v. United States Environmental Protection Agency

The Fifth Circuit stayed EPA's regional haze plan for Oklahoma and Texas until the underlying petitions for review challenging the rule are resolved. Texas, energy companies, power plants, and others challenged EPA's action disapproving...

Sierra Club v. United States Environmental Protection Agency

A district court ordered EPA to impose a "good neighbor” federal implementation plan (FIP) for Texas with respect to the 1997 fine particulate matter (PM2.5) NAAQS. In 2015, the D.C. Circuit...

Utah Physicians for a Healthy Environment v. Kennecott Utah Copper LLC

A district court dismissed on summary judgment environmental groups' lawsuit against a mining company for alleged SIP violations as it relates to NAAQS for coarse particular matter (PM10). Under the Utah SIP's "material moved" provision...

Arizona v. U.S. Environmental Protection Agency

The Ninth Circuit held that EPA did not act arbitrarily and capriciously when it disapproved in part Arizona's regional haze SIP and issued a replacement federal implementation plan (FIP) in place of the disapproved SIP elements. First...

National Parks Conservation Ass'n v. United States Environmental Protection Agency

The Third Circuit vacated and remanded EPA's approval of Pennsylvania's 2014 regional haze SIP. CAA §169A requires states to evaluate the impact that emissions from certain sources of pollution within their borders have on atmospheric...

Indiana v. Environmental Protection Agency

The Seventh Circuit upheld EPA's approval of revisions to Illinois' SIP, thereby rejecting challenges raised by Indiana. Indiana argued that the relaxation of Illinois' vehicle emissions testing program will decrease the likelihood that...

Association of Irritated Residents v. U.S. Environmental Protection Agency

The Ninth Circuit denied petitions for review challenging EPA's promulgation of 40 C.F.R. §52.245, a regulation that revised the scope of a previous EPA decision, after the Agency determined that it had mistakenly approved certain new...

Medical Advocates for Healthy Air v. U.S. Environmental Protection Agency

The Ninth Circuit denied a petition for review challenging EPA's approval of a revision to California's SIP that authorized the San Joaquin Valley air pollution control district to impose fees on mobile sources of pollution—primarily...

National Parks Conservation Ass'n v. U.S. Environmental Protection Agency

The Ninth Circuit granted in part and denied in part petitions for review challenging EPA's federal implementation plan to reduce regional haze at two power plants in Montana. The owner and operator of the plants, as well as...

Westar Energy, Inc. v. Environmental Protection Agency

The D.C. Circuit denied petitions for review challenging EPA's disapproval of a revision to Kansas' proposed SIP revision for the 2006 fine particulate matter (PM2.5) NAAQS. EPA disapproved the SIP revision because the submission lacked...

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