Children who live in areas with bad air pollution are more likely to develop asthma, which is the most common chronic illness among young people. But when you clean up the air does that actually protect the health of kids?
A study published Tuesday in JAMA, the journal of the American Medical Association, looked to answer that question.
The research focused on Southern California, long notorious for its smog. Over the past two decades, air quality has been markedly getting better, as stricter rules limit pollution from vehicles.
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