Aviation Impacts on the Atmosphere This town meeting at Birkbeck College in London, sponsored by the NERC Centres for Atmospheric Science, aims to identify the key research required to improve our understanding of atmospheric processes so as to better evaluate the impacts of aviation on the atmosphere. Scientific questions relating to climate change and air quality will be discussed. The meeting will consist of research talks and discussion sessions and will be of interest to both atmospheric scientists and aeronautical engineers. The aim of the meeting is to promote research collaboration but also there will be a published report, prepared by the organisers that will be used to make the case for additional Research Council and other funding, and provide input to technology-based assessments such as "Greener by Design". The meeting will be held from 1pm 11 November to 1pm 12 November 2004. Those interested in attending should register by sending an email to Linda Tse at l.tse@rdg.ac.uk. As space is limited we suggest registering as soon as possible, but in any case by 11 October. You should indicate if you want to give a talk and if so on which topic. Note however, that there can only be a small, but representative, set of presentations. Hotel accommodation is available at the Travel Inn Putney Bridge for those requiring it ? information will be provided following registration. The organisers of the meeting are: David Lee (d.s.lee@mmu.ac.uk), Helen Rogers (helen.rogers@atm.ch.cam.ac.uk) and Alan Thorpe (a.j.thorpe@rdg.ac.uk).