Description:
Collaborative studies by the City of Austin and the U. S. Geological Survey (USGS) have identified
coal-tar based sealcoat—the black, shiny emulsion painted or sprayed on asphalt pavement such
as parking lots—as a major and previously unrecognized source of polycyclic aromatic hydrocarbon
(PAH) contamination. Several PAHs are suspected human carcinogens and are toxic to aquatic
life. Studies in Austin, Texas, showed that particles in runoff from coal-tar based sealcoated
parking lots had concentrations of PAHs that were about 65 times higher than concentrations in
particles washed off parking lots that had not been sealcoated.
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