From: Mr P Hillman DBR-SSDC-Safety Assistant Head
Ministry of Defence Safety, Sustainable Development and Continuity Division
6th Floor Zone D.23
LONDON SW1A 2HB
Tel: 0207 218 8328
MOD (9621) 83228 MB
Fax: 0207 218 1413
MOD (9621) 81413 MB
Email: DBR-SSDC-Safety Enquires(multiuser)@mod.uk
E-mail dated 05 April 2009
21 April 2009
1. Thank you for your email of 5 April 2009 to the MOD Feedback on the MOD website. I am replying as this division has responsibility for safety and
environmental policy. You requested information on any research, information and reports of the theory of ‘chemtrails’. This has been considered
as a request for information in accordance with the Freedom of Information Act 2000 (FOIA).
2. First let me try and put the issue into perspective, weblogs and other commentators sometimes refer to the vapour trails left by aircraft as
‘chemtrails’. These vapour trails should more correctly be termed condensation trails or ‘contrails’ and are formed by the water vapour from
the engines of jet aircraft flying at high altitudes. To our knowledge, the only research on aircraft emissions undertaken by the Ministry of Defence
was carried by the Met Office which was on the effect of aircraft emissions on the climate. The outcome of this research was published in an IPPC
report called “Aviation and the Global Atmosphere 1999” (Available from Cambridge University Press). We are not aware of any further research
conducted by or on the behalf of the Ministry of Defence.
3. Contrails can remain in the sky for a long time under certain atmospheric conditions. Varying wind speeds in the upper atmosphere will cause the
trials to spread out into the ‘fine cloud’ observed, making the sky appear white rather than its usual blue colour. The main pollutants from jet
engines remain in the gaseous phase and are invisible to the eye. There are many natural phenomena associated with the presence of water in the
atmosphere which may produce optical effects involving the dispersion of white light into its component colours. It is most likely that the increase
in contrails is due to an increase in commercial airline traffic; National Statistics show that in the ten years 1992 to 2002 commercial air traffic
between UK and overseas increased from circa 880000 aircraft to circa 1275000 aircraft, this is approximately a 40% increase in air traffic movements
and numbers have continued to increase since these figures were produced.
4. If you are not satisfied with this response or you wish to complain about any aspect of the handling of your request, then you should contact me in
the first instance. If informal resolution is not possible and you are still dissatisfied then you may apply for an independent internal review by
contacting the Head of Corporate Information, 6th Floor, MOD Main Building, Whitehall, SW1A 2HB (e-mail CIO-XD@mod.uk). Please note that any request
for an internal review must be made within 40 working days of the date on which the attempt to reach informal resolution has come to an end.
5. If you remain dissatisfied following an internal review, you may take your complaint to the Information Commissioner under the provisions of
Section 50 of the Freedom of Information Act. Please note that the Information Commissioner will not investigate your case until the MOD internal
review process has been completed. Further details of the role and powers of the Information Commissioner can be found on the Commissioner's website,
6. I hope that this information is useful
Assistant Head SSDCD-Safety Policy and Assurance
END OF EMAIL
UK Military Denial at its best........