The pandemic response has cleared the air from Los Angeles to Wuhan, China The downtown Phoenix skyline is easier to see Tuesday as fewer motorists in Arizona are driving. (Ross D. Franklin/AP) Andrew FreedmanEditor focusing on extreme weather, climate change, science and the environment. April 9 at 10:56 AM The coronavirus pandemic has put much of the world into lockdown, with factories going idle and city streets turning into eerily empty walkways. With the case count and death toll still climbing, it’s unlikely that countries will be able to flick a switch and rapidly return to pre-pandemic economic activity. But one unintended upside to this crisis has been improved air quality, particularly in the hardest-hit areas where the most draconian measures have gone into force. This has been evident in Asia, including China’s Hubei province, where this virus began spreading among humans. It’s also a trend observed in Italy, another devastated region with several thousand deaths. Now, given that all but a handful of states have implemented stay-at-home orders, the air-quality shifts are also being seen in the United States. This offers a rare — and unintended — large-scale experiment for scientists to see how human emissions contribute to hazardous

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