The ULEZ - Cleaning London’s Air

London’s Ultra Low Emission Zone (ULEZ) is the largest clean air zone of its kind in the World, covering every borough and operating 24/7, year-round. Vehicles that don’t meet strict emissions standards must pay a daily charge, encouraging cleaner transport and reducing harmful pollutants.

Since its expansion in August 2023, the ULEZ has been found to have:

• Cut the number of older, polluting vehicles by 58%.

• Achieved 97% compliance, meaning most drivers pay nothing.

• In Outer London, it has reduced NOx emissions by up to 16% and PM2.5 exhaust emissions by 31%.

• Helped lower roadside NO₂ levels by nearly 5% compared to expected trends.

• For further details see the evaluation report.

Toxic air contributes to around 4,000 premature deaths annually in London and increases risks of asthma, cancer, and dementia. The ULEZ is a vital step toward cleaner air and healthier lives, with all revenue reinvested into London’s public transport network.