Measure would ban toxic pavement sealant

Washington is poised to become the first state to ban a toxic asphalt sealant made from industrial waste because its ingredients are turning up in ordinary house dust as well as in streams, lakes and other waterways at levels that concern government researchers.

A government researcher applies sealcoat at an Austin, Tex., test site.

Study sees parking lots dust as cancer risk

Chemicals in a cancer-causing substance used to seal pavement, parking lots and driveways across the U.S. are showing up at alarming levels in dust in American homes, prompting concerns about the potential health effects of long-term exposure, a new study shows.