Abstract
In 2013, China unveiled an ambitious plan to improve its air quality. The national government implemented strict policies aimed at reducing fine particulate matter (PM 2.5 ), a type of pollution responsible for about 1 million deaths in China each year. Its efforts have been largely successful—by 2020, PM 2.5 levels had dropped by nearly 40% . But new research suggests that by solving one pollution problem, China may have caused another ( Nat. Geosci. 2022, DOI: 10.1038/s41561-022-00972-9 ). China’s aggressive tactics for reducing PM 2.5 may have contributed to an increase in ozone, which can harm the environment and human health . According to the new study, ozone levels—which have risen in eastern China since 2013 ( Environ. Sci. Technol. Lett. 2020, DOI: 10.1021/acs.estlett.0c00171 )—depend heavily on the amount of particulates in the air. The effect isn’t unique to this region. Using a model that simulates the chemistry and
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