For more than a decade, researchers have suspected air pollution reduces IQ in humans, and the results show up as early as age 4 from in utero exposure. Now, it’s possible that more fresh produce, including leafy salads, sides of greens or oranges in mothers’ lunchboxes, could help mitigate the seriousness. Frances A. Tylavsky, a University of Tennessee Health Science Center professor of Preventive Medicine, and nine researchers across the country have found that folate, a common B vitamin in leafy green vegetables, citrus fruit and beans, may offset the effects by reducing the stress air pollution has on the neurological systems of unborn babies.