"A widely used type of asphalt sealant derived from coal tar may be making its way into the house dust of homes, according to new research. Young children may actually be playing on coal-tar-sealed driveways and playgrounds, potentially raising their exposure to harmful chemicals.

The findings, presented at a meeting of the Society of Environmental Toxicology and Chemistry, concern a group of compounds called polycyclic aromatic hydrocarbons, or PAHs. "

Jessica Marshall reports for Discovery News January 5, 2010. [2]