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London Low Emission Zone: https://tfl.gov.uk/modes/driving/low-emission-zone

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London Ultra Low Emission Zone (ULEZ): https://tfl.gov.uk/modes/driving/ultra-low-emission-zone

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London Low Emission Zone for Non-Road Mobile Machinery (NRMM): http://nrmm.london/

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Dieselnet: https://www.dieselnet.com/

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Air Quality News: https://www.airqualitynews.com/

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Full list of active European Low Emission Zones: https://urbanaccessregulations.eu/countries-mainmenu-147

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