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Is air pollution the single greatest risk to human health?

A new study from the University of Chicago says that air pollution is the single greatest risk to human health. According to Michael Greenstone, the lead author of the study, air pollution shaves two years off of the average life expectancy.

(Indian commuters drive amidst heavy smog along a busy road past the South Extension area of New Delhi. Credit: Xavier Galiana /Getty Images)

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3 minutes