Ultra Low Emission Zone: delivering cleaner air in London

The Low Emission Zone (LEZ) already operates to encourage the most polluting heavy diesel vehicles driving in London to become cleaner. The LEZ covers most of Greater London and is in operation 24 hours a day, 365 days of the year.

The Mayor has set out proposals for a central London Ultra Low Emission Zone from 2020 with the objective of reducing air pollutant and CO2 emissions from road transport. This would require cars to meet either a Euro 6 diesel emission standard or a Euro 4 petrol emission standard. 

Cars which do not meet one of these standards will be subject to an additional charge. This will operate separately to the Congestion Charge, which will remain focused on managing traffic and congestion in the central zone. 

ULEZ will be a world first, and will be a game-changer for London’s air quality, reducing road transport emissions by half and bringing London two-thirds of the way to compliance with EU legal limits for NO2.