| Coal-tar based pavement sealant is the leading source of polycyclic aromatic hydrocarbons (PAHs) in 40 urban lakes spanning the nation, according to research from the U.S. Geological Survey published this month. PAHs are a group of more than 100 chemicals that are produced when coal, oil and gas, garbage, or other organic substances.. Read more Posted in Lake Chemistry, Water Quality Also tagged PAHs, pollution, research, stormwater, USGS 1 Comment
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