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FILE- This file photo from July 14, 2010 shows smoke pouring from the United States Steel Corp.'s Clairton Coke Works in Clairton, Pa. A fire at U.S. Steel's massive coke plant outside Pittsburgh knocked a key pollution control system offline Monday, June 17, 2019. It triggered a health warning as officials monitored the air around the plant for signs of a release of toxic sulfur dioxide. It was the second fire since December at the coke works, the largest facility of its kind in the United States. The plant turns coal into coke, one of the raw materials of steel. (AP Photo/Keith Srakocic, File)

FILE- This file photo from July 14, 2010 shows smoke pouring from the United States Steel Corp.'s Clairton Coke Works in Clairton, Pa. A fire at U.S. Steel's massive coke plant outside Pittsburgh knocked a key pollution control system offline Monday, June 17, 2019. It triggered a health warning as officials monitored the air around the plant for signs of a release of toxic sulfur dioxide. It was the second fire since December at the coke works, the largest facility of its kind in the United States. The plant turns coal into coke, one of the raw materials of steel. (AP Photo/Keith Srakocic, File)

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