Cities can now achieve “what was once thought impossible”: cutting air pollution by 20–45% in little more than a decade. A new analysis has found that 19 cities, including London, San Francisco and Beijing, cut levels of both PM2.5 and nitrogen dioxide (NO2) by more than 20% since 2010, driven by measures such as cycle lanes, electric vehicles and restrictions on polluting traffic. The Guardian
https://www.theguardian.com/environment/2026/mar/12/london-san-francisco-and-beijing-achieve-remarkable-reductions-in-air-pollution
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