Pigeons are now being used to monitor air pollution in London.
Technology company, Plume Labs, have fitted ten pigeons with tiny backpacks which monitor nitrogen dioxide, ozone and volatile compounds.
The concept was the winning entry at the London Design Festival in the "solve a problem" category.
Racing pigeons will monitor pollution across London. A veterinarian has been put on hand to assist with the project to ensure the pigeons do not suffer any distress.
The campaign aims to encourage Londoners to become beta testers for a wearable version of Plume Labs air pollution measuring device. The company hope to show Londoners how air pollution affects them.
A website has been set up so you can view the pigeon's flight paths, for more information see: pigeonairpatrol.com.
Londoners can also tweet @PigeonAir to find out what pollution levels are in their area.
