Clean Air Council v. United States Steel Corp

PRECEDENTIAL UNITED STATES COURT OF APPEALS FOR THE THIRD CIRCUIT _______________ No. 20-2215 _______________ CLEAN AIR COUNCIL, Appellant v. UNITED STATES STEEL CORPORATION _______________ On Appeal from the United States District Court for the Western District of Pennsylvania (D.C. No. 2-19-cv-01072) District Judge: Hon. Marilyn J. Horan _______________ Argued: January 29, 2021 Before: RESTREPO, BIBAS, and PORTER, Circuit Judges (Filed: July 20, 2021) _______________ Lisa W. Hallowell Eric V. Schaeffer [ARGUED] ENVIRONMENTAL INTEGRITY PROJECT 1000 Vermont Avenue, N.W. Suite 1100 Washington,…