Already demonstrated to dramatically drop pollution on e.g. Ride100 days when large sections of London are car free. 2017 Ride100, https://cyclingindustry.news

Already demonstrated to dramatically drop pollution on e.g. Ride100 days when large sections of London are car free. 2017 Ride100, https://cyclingindustry.news/air-quality-sees-drastic-improvement-alongside-ridelondon-route/ https://cyclingindustry.news/air-quality-sees-drastic-improv... 2018 Marathon, https://www.standard.co.uk/news/london/london-marathon-figures-show-massive-89-per-cent-drop-in-air-pollution-a3821566.html https://www.standard.co.uk/news/london/london-marathon-figur...