Study links Chicago expressway pollution to violent neighborhood crime

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CHICAGO — Researchers may have discovered a hidden factor that could be driving violent crime — pollution.

A new study examined expressways in Chicago and compared area crime data and weather.

They found upticks in violent crime in neighborhoods on either side of the expressways, depending on which way the wind was blowing.

Researchers say pollution can influence behavior by effecting the central nervous system. Plus, irritating environmental conditions can lead to an increase in aggression.