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This investigation reveals a connection between common parking lot sealants and cancer-causing dust found in American homes. Coal tar sealant, meant to "protect pavement and asphalt" from cracking and other types of damage, slowly wears away over time. People can track the substance into their homes, which researchers believe is the reason "high levels of chemicals used in the sealant" shows up in house dust. The effects are potentially damaging, especially for "young children."