FOI request detail

Request for Data on effectiveness of Ultra Low Emission Zone

Request ID: FOI-0936-2122
Date published: 25 August 2021

You asked

Hi, I am currently working on a research project on the effectiveness of the Ultra Low Emission Zone with my research question being: To what extent has the Ultra Low Emission zone been successful in reducing the harmful emissions in London? In order to evaluate the effectiveness of ULEZ, I hope to look at the effectiveness of ULEZ as a disincentive across different income levels. Consequently, I was hoping to be able to access the number of people who commute into London from different boroughs over time (before and after the implementation of ULEZ) and whether they commute to London using public or private transport. I was also hoping to be able to access the number of people paying the Ultra Low Emission Zone charge from different boroughs over time (before and after the implementation of ULEZ) Please let me know if any further information is available.

We answered

Our ref: FOI-0936-2122/GH

Thank you for your request received by Transport for London (TfL) on 6 August 2021 asking for data on effectiveness of Ultra Low Emission Zone.

Your request has been considered under the requirements of the Environmental Information Regulations and our information access policy. I can confirm that we do hold some of the information you require.

Our ULEZ factsheets include information about how many people pay the ULEZ charge, the compliance rates for vehicles using the zone and the number of penalty charge notices that are issued. They can be accessed at We do not have a breakdown of ULEZ charges from different boroughs over time.

The Central London Ultra Low Emission Zone 2020 report evaluates the impact of the central London ULEZ, including vehicle compliance with the emission standards. It can be accessed at

Our Travel in London reports summarise trends and developments in travel and transport, including air quality, in London. They can be accessed from the TfL website at

Our London Travel Demand Survey is a continuous household survey of the London area and has been running since 2005/06 with an annual sample of around 8,000 households. It captures information on households, people, trips and vehicles and therefore allows for detailed analysis of trip making and its relationship to socio-demographic factors over time. The London Travel Demand Survey workbook, including a borough breakdown, can be accessed at

If this is not the information you are looking for, or if you are unable to access it for some reason, please do not hesitate to contact me.

If you are not satisfied with this response please see the attached information sheet for details of your right to appeal.

Yours sincerely

Graham Hurt
FOI Case Officer
FOI Case Management Team
General Counsel
Transport for London

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