Google News - 'Dramatic' plunge in London air pollution since 2016, report finds
https://www.theguardian.com/environment/2020/oct/03/dramatic-plunge-in-london-air-pollution-since-2016-report-finds
https://www.theguardian.com/environment/2020/oct/03/dramatic-plunge-in-london-air-pollution-since-2016-report-finds