Skip to main content
U.S. flag

An official website of the United States government

Worn sealcoat in Milwaukee, WI

June 2004 (approx.)

Detailed Description

Coal-tar-based sealcoat, a potent source of polycyclic aromatic hydrocarbons (PAHs), abrades into fine particles with time.  Here, runoff containing abraded particles goes down a storm drain and is delivered to a nearby lake. Read more about coal-tar-based sealcoat and PAHs here.


Public Domain.