Thank you for your email received by us on 30 December 2017 asking for information about the Travel in London report.

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

On page 12 of TfL's "Travel in London Report 10" found here http://content.tfl.gov.uk/travel-in-london-report-10.pdf. Your reports states "Although London now complies with limit values for PM10, continued reductions to ambient concentrations will bring further significant health benefits. Achieving this is however difficult, given that about 88 per cent of London’s road traffic emission now arises from vehicle brake and tyre wear and resuspension, with only limited technological options for improvement currently available."

What is the source and details behind the 88 per cent figure quoted?

I can advise that the source of this data is the London Atmospheric Emissions Inventory (2013 update), which is available via the London Datastore at: https://data.london.gov.uk/dataset/london-atmospheric-emissions-inventory-2013).This link takes you to the opening page, whilst the data files and documentation can be downloaded from the various other links in that section. Plus, a further breakdown of these numbers is given in section 6.9 on page 158 of the Travel in London 10 report.

In accordance with section 21 of the FOI Act, we are not obliged to supply you with a copy of the requested information as it is already accessible to you elsewhere.

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.

Please see the attached information sheet for details of your right to appeal as well as information on copyright and what to do if you would like to re-use any of the information we have disclosed.

Yours sincerely

Jasmine Howard
FOI Case Officer
Information Governance
Transport For London