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In a congested city like L.A.—as famous for smog as it is for the Hollywood sign—we all know outdoor air quality isn’t great.
Cars clog the freeways day and night, causing a grayish-brown haze that can be seen for miles. But the dirty air doesn’t stop there. According to Yifang Zhu, a professor in the Department of Environmental Health Sciences at UCLA’s Fielding School of Public Health, when outdoor air quality is bad, chances are, the air quality indoors is worse—but there are ways to improve it.
Zhu explains exactly what’s in our air and what people can do to breathe more freely when they’re holed up at home.