American Petroleum Institute v. Douglas M. Costle, Administrator, and Environmental Protection Agency, American Petroleum Institute and 15 of Its Member Companies, Chemical Manufacturers Association, the St. Louis Regional Commerce & Growth Association, Natural Resources Defense Council, the State of Oklahoma, E.I. Du Pont De Nemours & Co., Intervenors. E.I. Du Pont De Nemours and Company v. Douglas M. Costle, Administrator, and Environmental Protection Agency, American Petroleum Institute v. Environmental Protection Agency, and Douglas M. Costle, Administrator. Chemical Manufacturers Association v. Douglas M. Costle, Administrator, and Environmental Protection Agency, the Natural Resources Defense Council, Inc. v. Douglas M. Costle, Administrator of the Environmental Protection Agency, Chemical Manufacturers Association v. Douglas M. Costle, Administrator, and Environmental Protection Agency, the Connecticut Lung Association, Inc. v. Douglas M. Costle, Administrator of the U. S. Environmental Protection Agency, Sierra Club v. Douglas M. Costle, Administrator of the Environmental Protection Agency, Commonwealth of Virginia, Ex Rel. The State Air Pollution Control Board v. Environmental Protection Agency and Douglas M. Costle, Administrator, City of Houston, Texas v. United States Environmental Protection Agency and Douglas M. Costle, Administrator

Court of Appeals for the D.C. Circuit