Researchers are finding some of the chemicals used in pavement and driveway sealants are making their way into the environment. That could be putting the health of people and aquatic life at risk. These chemicals are called Polycyclic Aromatic Hydrocarbons, PAHs. They’re commonly found in low levels just about anywhere something is burned. But, the levels of PAHs are much, much higher in certain pavement sealing products, coal tar based sealants.