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Common Asphalt Sealant May Raise Cancer Risks
Date:4/4/2013

By Brenda Goodman
HealthDay Reporter

THURSDAY, April 4 (HealthDay News) -- Living near asphalt that's sealed with coal tar may raise the risk of getting cancer, a new study shows. The potential threat appears to be greatest for young children.

Coal tar, a byproduct of steel manufacturing, is a common ingredient in sealants that are used in the Eastern part of the United States to refresh worn parking lots and driveways.

"People like it because it makes the asphalt look like new. The striping shows up really clearly if you have a parking lot," said study author Barbara Mahler, a research hydrologist with the U.S. Geological Survey in Austin, Texas.

The problem, she added, is that shiny black sealcoats are a concentrated source of cancer-causing chemicals called polycyclic aromatic hydrocarbons, or PAHs.

"When tires drive across it, it's the grinding action of the tires that breaks up the little particles and grinds it up to a dust, essentially," Mahler said.

That dust gets carried into homes on shoes and hands. It's also washed into the surrounding soil and waterways after a rain, she said.

Previous studies have found high levels of PAHs in dust vacuumed from homes that sit near sealcoat-covered asphalt, according to study background information.

For the new study, published recently in the journal Environmental Science & Technology, researchers compared the levels of PAHs in house dust swept from 23 ground-level apartments in Austin. About half of the apartments sat on parking lots that were coated with coal-tar sealants; the rest did not.

The researchers combined those levels with measurements of PAHs in soils sampled near parking lots with and without coal tar-based sealants in New Hampshire and Chicago.

Next, they plugged those numbers into models used by the U.S Environmental Protection Agency (EPA) to assess what is called excess cancer risk. They wante
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