New research shows pollution from cars is responsible for 4 million new cases of childhood asthma each year.

Children spend a lot of time outdoors playing tag, shooting hoops, or climbing trees. If they live in cities, they might run around near busy roads. Parents always teach their kids to watch out for oncoming cars and never run into the street — but no one tells them not to breathe.

Photo Via Maxpixel by Creative Commons Zero – CC0

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