Pavement Sealer Ban Linked to Cleaner Lake Water.
A ban of certain types of pavement sealants made from coal tar has led to lower levels of cancer-causing compounds called polycyclic aromatic hydrocarbons (PAHs) in an Austin, Texas lake. In 2006, Austin was the first city in the United States to ban these types of pavement sealants. Past studies have shown that PAHs cause cancer in animals, and there are concerns that these compounds could be harmful to human health as well.
Environmental Science & Technology, June 2014