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Pollution 'harms cognitive intelligence'

A new study suggests that air pollution causes a significant reduction in intelligence.
We all know that poor air quality can affect our physical health, but a major new study reveals that air pollution can harm cognitive performance. Researchers believe that the negative impact increases with age, and affects men with less education the worst. Dr Xi Chen, from the Yale School of Public Health, told us more.

Photo: Beijing cyclist rides past buildings shrouded in smog. 
Credits: Frederic J. Brown/AFP/Getty Images.