You probably wouldn’t dream of lighting up a cigarette or getting drunk while you’re pregnant, but you could very well be doing something that can be quite harmful to your unborn child if you’re being exposed to pesticides.

This isn’t a warning that only applies to farm workers; 33 million pounds of organophosphate pesticides were used in the U.S. in 2007 alone, putting countless people at risk.

Three studies that examined children from very different backgrounds all reached the same conclusion: Prenatal exposure to these pesticides can have a significant long-term adverse effect on a child’s brain health, and it doesn’t matter if that exposure came from crops or cockroach control products. We’re not talking about a small difference, either; the exposure lowered children’s IQ by as many as seven points!

In the two studies that took place in New York, inner-city children aged 6 to 9 who had been born to mothers who were exposed to chlorpyrifos noted working memory decreases of 2.8 percent and IQ drops of 1.4 percent for every increment of exposure. This means the effect is linear; those who had higher levels of exposure experienced more negative effects on cognition. It’s a drop that can cause serious problems in math and reading.

Another study, this one carried out in California, looked at 300 children who lived in Monterey County agricultural communities where organophosphates were sprayed on crops and wind drift made exposure even worse. Their mothers had been studied during pregnancy to assess the organophosphate metabolites in their systems to determine their exposure. Their offspring underwent tests during childhood that included intelligence tests.

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