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Common Asphalt Sealant May Raise Cancer Risks

Small study looked at coal-tar sealcoat and exposure to 'PAH' chemical compound

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That's partly because children have different habits than adults. They spend more time near the ground, and they like to put things in their mouths, like their hands or toys. Kids are also smaller, so their exposures to chemicals are more concentrated relative to their body weights.

"Really, what this analysis says is that there's potential harm here. There is risk," said Kenneth Portier, a biostatistician with the American Cancer Society not involved in the research. "What does it mean for me? Maybe I should try to avoid that risk. And especially avoid the risk in my children."

Fortunately, there is an alternative to coal tar-based sealants. A different kind of sealant, made with emulsified asphalt, has much lower levels of PAHs. It's the main kind of sealant used in Western states, but it can also be found in other parts of the country with a bit of searching.

Although the study found an association between coal-tar sealcoat and a higher exposure to a cancer-causing compound, it did not prove that the exposure might cause cancer.

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