Are there PAH concentrations of concern in asphalt-based pavement sealants?

Coal tar and asphalt have different molecular structures stemming from their origins: coal tar is a byproduct of the production of coke from coal and asphalt is derived from the refining of crude petroleum. Product analyses by the City of Austin indicates that coal tar sealcoat products have median concentrations of total PAHs about 70 times higher than concentrations in asphalt-based sealcoat products.