Dear Transport for London,

How was the decision taken to set the NOX levels at 0.08 for cars to be compliant for ulez exemption
Was or is there any scientific evidence to how this decision was made or any consultation with car manufacturers

Yours faithfully,

Mark jones

FOI, Transport for London

Dear Mr Jones

 

Our Ref:         FOI-4310-2324

 

Thank you for your request received on 21 February 2024 asking for
information about NOx levels.

 

Your request will be processed in accordance with the requirements of the
Environmental Information Regulations and our information access policy.

 

A response will be sent to you by 19 March 2024. We publish a substantial
range of information on our website on subjects including operational
performance, contracts, expenditure, journey data, governance and our
financial performance. This includes data which is frequently asked for in
FOI requests or other public queries. Please check
[1]http://www.tfl.gov.uk/corporate/transpar... to see if this helps you.

 

We will publish anonymised versions of requests and responses on the
[2]www.tfl.gov.uk website. We will not publish your name and we will send
a copy of the response to you before it is published on our website.

 

In the meantime, if you would like to discuss this matter further, please
do not hesitate to contact me.

 

Yours sincerely

 

Gemma Jacob

Senior FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London

 

[3][TfL request email]

 

 

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FOI, Transport for London

2 Attachments

Dear Mr Jones

 

Our Ref:         FOI-4310-2324

 

Thank you for your request received on 21 February 2024 asking for
information about the Ultra Low Emission Zone (ULEZ) NOx levels.

 

Your request has been considered in accordance with the requirements of
the Environmental Information Regulations (EIR) and our information access
policy. I can confirm that we do hold the information you require. You
asked:

 

How was the decision taken to set the NOX levels at 0.08 for cars to be
compliant for ulez exemption Was or is there any scientific evidence to
how this decision was made or any consultation with car manufacturers

 

When the technical standard for the ULEZ was defined, prior to launch in
Central London in 2019, it was determined that the lowest possible limit
for NOx emissions would be needed to meet air quality targets. The latest
emission standard for passenger cars was Euro 6, which sets a limit of
0.08g/km NOx measured on the type-approval type 1 test for diesel engines.
Hence this limit was selected for compression ignition vehicles. The Euro
4 standard for petrol passenger cars also has a limit of 0.08g/km NOx over
the type 1 test, so this figure was selected for positive ignition
vehicles allowing drivers a lower cost means to comply with the ULEZ since
a petrol car of 12 years old (in 2019) would be a compliant vehicle.
Please see a copy of the original 2014 consultation attached (please refer
to sections 9, 10 and 15). Please note that the ULEZ standards also match
the emissions standards used for Clean Air Zones across England
([1]https://www.gov.uk/guidance/driving-in-a...).

 

We do not hold information on any engagement with motor manufacturers
specifically on the emission standards. This would have been conducted
over ten years ago so is outside our retention periods. However,
manufacturers and other relevant stakeholders would have been able to
provide comments and views as part of the public consultation process.

 

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

 

Please see the attached information sheet for details of your right to
appeal.

 

Yours sincerely

 

Gemma Jacob

Senior FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London

 

[2][TfL request email]

 

 

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