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ASPHALT MAINTENANCE & REPAIR
The new U.S.G.S. study compared house dust from 23 ground-floor apartments in Austin — 11 with coal tar-sealed parking lots and 12 coated with other substances, or not sealed at all. The study found that dust in the apartments next to the coal-tar-sealed lots had PAH pollution levels 25 times higher, on average, than the other lots. More than half the apartments with the coal tar-sealed lots contained dust with levels of PAHsthat would increase the risk of cancer if ingested by preschoolers, The researchers said. They came to this conclusion by comparing their results to a 2008 study that estimated those risks based on lab tests on animals. The increased risk means one additional child in 10,000 would develop cancer if exposed to that level of toxins over a lifetime.
Asphalt Maintenance & Repair is one of the largest applicators of a safe "Enviromentally Friendly" seal coat product called PMM or Polymer-Modified Master Seal.
Scientists with the U.S. Geological Survey say the coal tar sealant — one of two types commonly used in the U.S. — doesn’t stay put. It slowly wears off and is tracked into homes on the shoes of residents. .The USGS study, which found high levels of chemicals used in the sealant in house dust, marks the first time researchers have raised alarms about potential health effects for humans — especially young children — from the parking-lot coatings. Taken with previous studies indicating that the chemicals contaminate waterways, where they have been shown to harm insects and tadpoles, the finding raises serious questions about the advisability of using coal tar as a sealant, the scientists say.