Requesting information regarding Nox values of cars
Request ID: FOI-1905-2324 Date published: 25 September 2023
You asked
I would like to know whether cars Nox value, does tfl go to 2 decimal places. So for example if a car Nox value is 0.086, how tfl goes to 2 decimal places, would this mean that a car would then read Nox as 0.08?
We answered
Our ref: FOI-1905-2324/GH
Thank you for your request received by Transport for London (TfL) on 1 September 2023 asking for information about [summary of request].
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 the information you require.
By way of background, we are able to establish a charging scheme such as the Ultra Low Emission Zone (ULEZ) through devolved authority set out in Schedule 23 of the Greater London Authority Act 1999. As part of that schedule, and in line with the Mayor’s Air Quality Strategy, we have worked to develop 2 charging schemes, the London Low Emission Zone (LEZ), and the ULEZ. Both of these schemes are found within the London Low Emission Zone Scheme Order 2006 as varied – the ‘Scheme Order’. This is the administrative tool and effectively provides the information you seek. A copy of the Order is available here http://content.tfl.gov.uk/lez-scheme-order.pdf
It sets out the specific vehicles affected by the schemes in Article 4 and how they may be compliant, it outlines the vehicles not impacted by the scheme in Article 5, and in Article 6 it sets out that a vehicle meets the standards required of the ULEZ if Transport for London is satisfied the vehicle meets the emissions standards specified for that vehicle in Tables 2 to 6 of Part 2 of Annex 2.
The scheme Order specifies, limit values for NOx (grams per kilometre) as 0.08. Emissions greater than this would be deemed as non-compliant. As 0.086 is greater than 0.08, a vehicle emitting NOx of 0.086, would therefore be classified as non-compliant.
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
