Guidance

Aircraft contrails

Explains what contrails are and provides information about the health and environmental effects.

• From: Department for Transport
• Published: 2 October 2012
• Last updated: 2 August 2022
  Show all updates

  1. 2 August 2022

     Amendment of geo-engineering and weather modification information.

  2. 24 May 2021

     Updated with the latest information on contrails.

  3. 26 April 2018

     Links updated.

  4. 30 July 2015

     Updated to remove references to chemtrails and barium measurements.

  5. 2 October 2012

     First published.

Documents

Aircraft contrails

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Details

Factual paper on aircraft contrails explaining:

• what they are and how they are caused
• the health effects
• the environmental effects