APNewsBreak: Environmental groups accuse Exxon Mobil of thousands of Clean Air Act violations

APNewsBreak: Groups say Exxon violates US air laws

Hyperion seeks to amend parts of its air quality permit for southeast SD oil refinery

Board to review parts of Hyperion permit

PIERRE, S.D. — A judge on Tuesday granted a request from Hyperion Resources to have a state board reopen the permitting process for a $10 billion oil refinery the company wants to build in southeast South Dakota.

Court asked to overturn air quality permit for proposed South Dakota oil refinery

Court asked to overturn air permit for SD refinery

Westar Energy, federal agencies settle environmental lawsuit; upgrades to Kan. plant coming

Kan. utility, federal agencies settle lawsuit