Pollution hangs in the air over a United States Steel Corporation coke plant in Clairton, Pennsylvania, April 1973. Previously it had been cited for violations of the Clean Air Act.

Pollution hangs in the air over a United States Steel Corporation coke plant in Clairton, Pennsylvania, April 1973. Previously it had been cited for violations of the Clean Air Act.

Courtesy Still Picture Records Section, Special Media Archives Services Division, National Archives and Records Administration.