United Kingdom · Government Agency
The local government body responsible for the transport system in Greater London, which designed, implemented, and manages the world's most prominent ULEZ.
A leading provider of intelligent traffic systems, Yunex develops the camera and software infrastructure used to enforce Low Emission Zones in major cities like London.
A global provider of intelligent transportation systems, specializing in tolling, traffic management, and urban access management solutions required for emission zones.
Paper
Further improvement in London’s air quality demands more than the Ultra Low Emission Zone policynpj Clean Air · Oct 22, 2025
A peer-reviewed study analyzing the impact of London's ULEZ, finding significant reductions in NO2 (19.6%) and NOx (28.8%) in central London following its 2019 introduction, though noting diminishing returns for the 2023 expansion due to high pre-compliance.
News
London’s ULEZ cut air pollution — high vehicle compliance left little room for post-expansion gainsUniversity of Birmingham · Oct 22, 2025
University news release discussing the npj Clean Air study, explaining that while ULEZ was highly effective initially, the high rate of pre-compliance for the 2023 expansion limited further relative gains.
Article
Can Fees on Polluting Cars Clean the Air? London Has New Evidence.nytimes.com
The city’s expanded low-emissions zone, which was politically fraught, has cut emissions that contribute to health problems like asthma, new numbers show.
Spain · Company
Specializes in remote sensing devices that measure real-world driving emissions of vehicles as they pass, supporting data-driven Low Emission Zone enforcement.
C40 Cities
United States · Consortium
A network of the world's leading mayors united in action to confront the climate crisis, actively promoting and providing frameworks for Low Emission Zones.
Germany · Company
A photonics group whose Smart Mobility division produces ANPR cameras and civil security technologies used in enforcing environmental traffic restrictions.
Sweden · Company
A leading provider of traffic safety solutions, including ANPR (Automatic Number Plate Recognition) systems used for Low Emission Zone access control.
United States · Company
A business process services company that provides public safety and transportation solutions, including automated enforcement systems for congestion and emission zones.
United Kingdom · Company
Provides end-to-end design, build, and enforcement services for Clean Air Zones (CAZ) and Low Emission Zones in the UK.
United Kingdom · Nonprofit
A philanthropic initiative tackling air pollution by funding projects and campaigning for policies like Low Emission Zones.
Article
Ultra Low Emission Zonetfl.gov.uk
To help clear London's air, the Ultra Low Emission Zone (ULEZ) operates 24 hours a day, 7 days a week, every day of the year, except Christmas Day (25 December). The zone operates across all London boroughs, and does not include the M25.
Article
Drive in a clean air zonegov.uk
Use this service if you’re planning to drive through clean air zones in: Bath Birmingham Bradford Bristol Greater Manchester (under review) Portsmouth Sheffield Tyneside - Newcastle and Gateshead
This solution is an innovative response to the pressing issue of urban air pollution, a challenge that has been exacerbated by the growth of cities and the increasing number of vehicles on the roads. The Ultra Low Emission Zone (ULEZ) addresses the need to reduce harmful emissions, such as nitrogen dioxide (NO₂) and particulate matter (PM), which significantly contribute to respiratory illnesses, climate change, and the overall degradation of urban environments.
At its core, ULEZ is a designated area within a city where the strictest emission standards are enforced. Vehicles that do not meet these stringent criteria are required to pay a daily charge to enter the zone, thereby incentivising the use of cleaner, more efficient vehicles and discouraging the use of older, more polluting models. The technology underpinning the ULEZ relies on an extensive network of cameras and sensors that automatically read vehicle number plates, cross-referencing them with a database to determine compliance with emission standards.
This system functions in real-time, ensuring that only vehicles that meet the required standards can freely access the zone without penalty. By doing so, the ULEZ effectively reduces the concentration of harmful pollutants in high-traffic areas, leading to cleaner air, improved public health, and a more sustainable urban environment. Moreover, the implementation of ULEZ encourages the adoption of electric vehicles (EVs) and other low-emission alternatives, further advancing the city’s transition to a low-carbon future.
As urban populations continue to grow, the strain on public health systems due to pollution-related illnesses is expected to rise unless proactive measures like ULEZ are widely adopted. Additionally, by reducing the environmental impact of urban transportation, cities can become more resilient against the effects of climate change. This is particularly crucial as urban areas are often at the forefront of the battle against global warming, given their high energy consumption and carbon footprints.
