Breathing in toxic fumes every day is bad for you, and when you take those fumes away, you feel better. That’s the gist of a new study published in JAMA, which came to the rather obvious conclusion that kids in Los Angeles exhibited elevated risk of developing asthma because the city used to sit in a massive cloud of car exhaust.

The research, which is actually rather interesting despite seeming a bit obvious, suggests that smog levels in Los Angeles had a direct correlation with the number of cases of childhood asthma. Using data gathered from 1993 through 2014, the paper points to improved air quality levels in a number of communities as being the reason for an overall decrease in the number

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