Emissions

The request was successful.

Transport for London,

Dear Sir/ Madam

Could you please confirm that when the readings and counting were taken for emissions in London did those emissions include.

1. Number of trains in use on the day/s whilst entering and leaving London and how many.

2. Number of aircraft in use on the day/s while flying over London and how many.

Yours faithfully,

D.Little

FOI, Transport for London

Our ref: FOI-0195-1011

Date: 29.12.2010

Dear Mr Little

Thank you for your email received by Transport for London (TfL) on 29
December 2010 asking for information about emissions.

Your request will be processed in accordance with TfL's Freedom of
Information Act 2000 procedure and a response will be provided to you by
28 January 2011 in accordance with the Act.

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

Yours sincerely

Graham Hurt

FOI Case Officer

FOI Case Management Team

Corporate Governance Directorate

General Counsel

Transport for London

[1][TfL request email]

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FOI, Transport for London

Our ref: FOI-0195-1011

Date: 31.12.2010

Dear Mr Little

Thank you for your email received by Transport for London (TfL) on 28
December 2010.

Unfortunately, from the description provided, we cannot identify the
information you have requested.

To enable us to assist with your request, please provide a more detailed
description. If you are referring to a specific report or survey which
TfL has published with regard to emissions, please provide a link or the
title of this, together with any other details you think might help us
locate the information you require.

Please note that the 20 working day deadline for responding to your
request will depend on when we receive satisfactory additional
information to help clarify your request.

If we hear nothing further from you by the 21 January, your request will
be closed and any further correspondence will be treated as a new FOI
request.

In the meantime, if you have any queries or would like to discuss your
request, please do not hesitate to contact me.

Yours sincerely

Graham Hurt

FOI Case Officer

FOI Case Management Team

Corporate Governance Directorate

General Counsel

Transport for London

[1][TfL request email]

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Dear FOI,

Thank you for your reply I would like you to confirm that when testing was carried out for the Mayor’s Air Quality Strategy.

Could you please confirm that when the readings and counting were taken for emissions in London did those emissions include.

1. Number of trains in use on the day/s whilst entering and leaving
London and how many.

2. Number of aircraft in use on the day/s while flying over London and how many.

Yours sincerely,

d.little

FOI, Transport for London

1 Attachment

Our ref: FOI-0195-1011

Date: 28.01.2011

Dear Mr Little

Thank you for your email received by Transport for London (TfL) on 29
December 2010 asking for information about the Mayor's Air Quality
Strategy.

Your request has been considered under the requirements of the Freedom of
Information Act 2000 and I can confirm that TfL does hold some of the
information you require.

The Mayor's Air Quality Strategy has been developed using modelling which
is based on the London Atmospheric Emissions Inventory (LAEI). The Greater
London Authority (GLA) compiles the LAEI and this database provides
information on emissions from all identifiable pollution sources in
Greater London. The current full LAEI includes emissions data for the
'base year' 2008 and projections for years 2011 and 2015.

The LAEI 2008 has now been released on the London Datastore for free, and
can be accessed at: [1]http://data.london.gov.uk/laei-2008

Information contained within the 2008 LAEI relating to the rail network
was supplied by the train operating companies. For aircraft, Department
for Transport statistics on aircraft movements between 2002 and 2008 were
used to estimate the changes in aircraft related emissions.

Since the publication of the 2008 LAEI, Heathrow Airport Ltd has completed
an update of the Heathrow Emissions Inventory (HEI). While there are some
methodology changes to emissions estimates undertaken for the HEI update,
the main change is reallocation of aircraft operations since the opening
of Terminal 5. A comparison of emissions totals from the LAEI and HEI
indicates that NOx emissions from Heathrow are slightly underestimated
within the LAEI compared with the HEI update. However, ground level
aircraft emissions estimates are higher within the LAEI, and these sources
are more important in terms of modelling of concentrations around the
airport. Overall, the LAEI 2008 total ground based NOx emissions are 2 per
cent higher than the HEI and this is not significant in terms of the
modelled NO2 concentrations provided within the Mayor's Air Quality
Strategy.

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

Corporate Governance Directorate

General Counsel

Transport for London

[2][TfL request email]

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