PITTSBURGH, Dec. 14, 2022 /PRNewswire/ -- Koppers Holdings Inc. (NYSE: KOP), an integrated global provider of treated wood products, wood treatment chemicals and carbon compounds, has been named as one of America's Most Responsible Companies by Newsweek magazine for the third consecutive year. Koppers ranked No. 179 out of 500 finalists and No. 20 out of 55 companies in the Materials & Chemicals category.
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