Study finds parking lot sealcoat may be major source of PAHs

摘要

A joint study by the U.S.Geological Survey and the City of Austin(Texas)has found that runoff from parking lot sealcoat,a black coating used to protect and beautify asphalt,is a previously unrecognized source of polycyclic aromatic hydrocarbons(PAHs).Abraded sealcoat may be an important contributor to PAHs found in U.S.streams,the researchers say.