USGS: PAHs and Coal-Tar-Based Pavement Sealcoat


Here is an excerpt from the article: 

Coal-tar-based sealcoat products typically are 20 to 35 percent coal-tar pitch. Product analyses indicate that coal-tar-based sealcoat products contain about 50,000 mg/kg PAH - about 100 times more PAHs than in used motor oil and about 1,000 times more PAHs than sealcoat products with an asphalt base.

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Posted on January 13, 2014 .