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 its pre-pandemic levels, with scientists warning that Europe may follow suit.
Lockdowns prompted by the coronavirus outbreak led to dramatic drops in dirty air across the world as traffic and some industry ground to a halt. 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 the lockdown, with some measures being taken such as expanding cycle lanes and space for walking in cities around the world.
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