Pesticide Combination Impacts Often Greater Than the Sum of Their Parts, New Study Says

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All together about 30 million pounds were used on California farm fields in 2013 alone and together they account for about a fifth of all pesticides used in the state.

"Fumigants are completely different beasts than other pesticides," says Miranda Fram, U.S. Geological Survey chemist and California Groundwater Ambient Monitoring and Assessment Program chief.

Dozens of people have had to evacuate their homes and schools due to pesticide drift, in California and elsewhere around the country.

The U.S. Environmental Protection Agency considers 1,3-dichloropropene and metam sodium probable human carcinogens, while California's Department of Pesticide Regulation has found that chloropicrin exposure can increase risk for cancer.

She explains, metam and chloropicrin "Can exacerbate, if not cause asthma, which is a huge problem in California due to smog and these pesticides do contribute to smog."

The group points out that more than 500,000 California children currently attend schools near the state's heaviest and most hazardous pesticide use.

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