COAL TAR INFORMATION. Coal tar based sealcoats are one of the options for applying on asphalt driveways for protecting them from weathering and maintaining a dark, glossy appearance. Coal tar contains a high level of polycyclic aromatic hydrocarbons (PAH), a class of chemical organic compoounds, several of which are very toxic. Prolonged exposure to the PAHs in coal tar are hazardous to human health, animal health and aquatic health whether ingested, inhaled or absorbed through the skin.The Village is considering banning the use of coal tar sealants. To learn more, click here.