Climate Change

As China cuts its air pollution, an unseen killer has emerged

A man wearing a mask walks on a street on a hazy day in Beijing October 24, 2014. REUTERS/Kim Kyung-Hoon (CHINA - Tags: ENVIRONMENT SOCIETY) - GM1EAAO1ENZ01

Ozone both helps and harms us. Image: REUTERS/Kim Kyung-Hoon

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 A 100-meter-tall air purifier in Xi’an City, Shaanxi province, Jan. 17, 2018.
A 100-meter-tall air purifier in Xi’an City, Shaanxi province, Jan. 17, 2018. Image: IC
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