Request ID: FOI-3215-2223 Date published: 27 March 2023
You asked
Hello
Please advise what information you hold
A. that converts the PPM of the HC on the MOT test into g/¬km see 1st document
B that would give the NOx figure on kn¬owing the CO and the HC +NOx that is on the C of C see 2nd document
I require this inf¬ormation to be able to confirm whether or not XXXX is UlEZ compliant
We answered
Our ref: FOI-3215-2223/GH
Thank you for your request received by Transport for London (TfL) on 28 February 2023 asking for information about ULEZ compliance.
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.
that converts the PPM of the HC on the MOT test into g/km see 1st document
It is not possible to convert the PPM concentrations measured on a MOT test into a g/km figure that would be measured over the type-approval drive cycle. Furthermore, hydrocarbons (HC) are not used to assess compliance with ULEZ. That is NOx.
that would give the NOx figure on knowing the CO and the HC +NOx that is on the C of C see 2nd document
The certificate of conformity gives NOx in the form of an HC+NOx combined figure. That was the way type approval worked at Euro 2. From Euro 3 onwards, the figures are separated out.
It is most unlikely that the NOx emissions of a Euro 2 would be compliant with the Euro 4 petrol limit of 0.08g/km NOx even if they were tested separately. In the absence of this data we would judge the vehicle to be non-compliant based on the age and Euro approval level.
If this is not the information you are looking for, 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
