The ULEZ euro standard specifications can be found in the Greater London ULEZ Charging Order 2006 (PDF 239KB).
We relied on evidence from several sources when developing proposals to create the ULEZ.
Air pollution is one of the most significant challenges facing London, affecting the health of all Londoners. Every child in London breathes toxic air daily, damaging their lung growth. Road transport is the biggest source of the emissions damaging health in London.
Around half of emissions of oxides of nitrogen (NOx), which contribute to illegal levels of nitrogen dioxide (NO2), and particulate matter (PM) come from transport. These pollutants make chronic illnesses worse, shorten life expectancy and can damage lung development.
The communities suffering most from poor air quality are often the most vulnerable, including the children of London. At least 360 primary schools are in areas exceeding safe legal pollution levels.
To help improve the air we breathe we're introducing measures to promote more walking, cycling, use of public transport and to encourage sustainable freight deliveries.
Evidence for this view comes from:
Road transport as biggest source of health-damaging emissions
Reference: London Datastore, Greater London Authority
London Atmospheric Emissions Inventory (LAEI) 2013
Lung growth in children
Reference: Royal College of Physicians, 2017
Every breath we take: the lifelong impact of air pollution
Improving the air we breathe
Reference: ULEZ consultation, TfL
ULEZ consultation page