London, San Francisco and Beijing are among 19 global cities that have achieved “remarkable reductions” in air pollution, analysis has found, having slashed levels of two airway-aggravating pollutants by more than 20% since 2010. The analysis found interventions such as cycle lanes, uptake of electric cars and restrictions on polluting vehicles had helped to drive the improvements. Beijing and Warsaw topped the ranking for cleaning up fine particulate pollution (PM2.5), reducing levels by more than 45%, while Amsterdam and Rotterdam saw the greatest improvement in nitrogen dioxide (NO2), with cuts of more than 40%. San Francisco was the only US
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