Some of the more than 500 million pounds (220 million kg) of pesticides used yearly in the United States are concentrated at levels that pose a concern for fish and water-dwelling insects, the U.S. Geological Survey report on pesticides from 1992 to 2011 said. The levels seldom topped human health standards.
The potential for damage to aquatic life was likely underestimated since lack of resources meant researchers could monitor fewer than half of the more than 400 pesticides used agriculturally each year, the study said.
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