The ULEZ Year One Report highlights that roadside nitrogen dioxide (NO₂) emissions are estimated to be 27 per cent lower across the capital compared to a scenario without ULEZ and its expansion.
A new report published today (Friday, 7 March) reveals that the expansion of the Ultra Low Emission Zone (ULEZ) in August 2023 has significantly improved air quality across London, reducing harmful emissions and benefiting millions of residents.
The ULEZ Year One Report, released by City Hall and Transport for London, highlights that roadside nitrogen dioxide (NO₂) emissions are estimated to be 27 per cent lower across the capital compared to a scenario without ULEZ and its expansion.
Waltham Forest has seen particularly strong results, with emissions estimated to have dropped by 35 per cent, including a 12 per cent reduction directly attributed to the zone’s recent expansion.
Major Health and Environmental Benefits
ULEZ was introduced to tackle air pollution, which contributes to serious health conditions such as asthma and lung disease. The report indicates that some of London’s most deprived communities, often living near the busiest roads, are experiencing up to an 80 per cent reduction in illegal air pollution levels.
“Our task is supporting people to think carefully about whether there are other cleaner and safer options available for their journey, such as walking, cycling, or public transport and help them make that switch.”
Clyde Loakes MBE, Deputy Leader
Cllr Clyde Loakes MBE, Deputy Leader and Cabinet Member for Climate and Air Quality at Waltham Forest Council, welcomed the findings:
“This is yet more proof that the Mayor’s ambitious work, along with our efforts in Waltham Forest, is delivering real benefits for residents. The improvements in air quality are undeniable, and they are protecting the health of Londoners, particularly those in areas that have suffered the worst pollution.”
He emphasised that ULEZ is not about penalising drivers, but rather supporting people to make cleaner transport choices:
“97 per cent of vehicles driving in London are now ULEZ-compliant and are not charged. The goal is to encourage those who can switch to walking, cycling, or public transport to do so. That’s why we’re continuing to invest in cycle infrastructure, expanding our network of cycle hangars, and improving step-free access at Leyton Underground Station.”
ULEZ Report: Key Findings
• Roadside NO₂ pollution down by 27 per cent across London, reducing exposure to a toxic gas linked to asthma, lung disease, and cancer.
• NOx (nitrogen oxide) and PM2.5 exhaust emissions from cars and vans in Outer London down by 14 per cent and 31 per cent respectively.
• 99 per cent of air quality monitoring sites across London have shown improved air quality since 2019.
Continued Efforts to Improve Air Quality
London Mayor Sadiq Khan introduced ULEZ to tackle the city’s longstanding pollution crisis, which has contributed to thousands of premature deaths. Despite initial controversy, the report suggests the scheme is delivering tangible improvements, with the majority of vehicles now compliant and air pollution levels steadily declining.
In Waltham Forest, the council is taking additional steps to support clean air initiatives. Over the coming year, it plans to install more cycle hangars, expand separate cycle tracks, and consult on a new low-traffic neighbourhood to further reduce reliance on polluting vehicles.
As efforts continue, the ULEZ expansion is proving to be a crucial step in making London a cleaner, healthier place to live.
