Emissions of carbon dioxide from aviation are reported in submissions to the United Nations Framework Convention on Climate Change and to the United Nations Economic Commission for Europe.
In accordance with internationally agreed guidelines, the UK estimates emissions from both domestic and international aviation, including from military aviation. However, emissions from international aviation are recorded as a memo item, and are not included in national totals.
Emissions of carbon dioxide are estimated using aircraft movement data and the carbon contents of the fuels the aircraft consume. The current method estimates emissions from the number of aircraft movements broken down by aircraft type at each UK airport, and so complies with the Intergovernmental Panel on Climate Change Tier 3 (top tier) specification. The carbon contents of aviation fuels are estimated through periodic analyses of the aviation fuels produced.