Data released by TfL reveals how much money drivers in each London borough have paid in Ulez charges since the clean air zone was launched in 2019:
https://www.standard.co.uk/news/transport/ulez-ultra-low-emission-zone-fixed-penalty-notices-charges-fines-tfl-b1209536.html
https://www.standard.co.uk/news/transport/ulez-ultra-low-emission-zone-fixed-penalty-notices-charges-fines-tfl-b1209536.html
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https://www.standard.co.uk/news/transport/ulez-ultra-low-emission-zone-fixed-penalty-notices-charges-fines-tfl-b1209536.html