Cleaner skies were a silver lining of pandemic but data indicates air quality receding as lockdowns eased
Air pollution in China has climbed back to pre-pandemic levels, and scientists say Europe may follow suit.
Air pollution causes at least 8m early deaths a year, and cleaner skies were seen as one of the few silver linings of Covid-19. Experts have called for action to help retain the air quality benefits of lockdowns, and measures taken to date have included expanding cycle lanes and space for walking in cities.
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