Pigeons do Air Patrolling in the sky to track Air Pollution Levels

Since a couple of days, Ten pigeons were seen with tiny backpacks flying over London monitoring the city's pollution levels. Pigeon Patrol, as they called by the companies behind the project, is live tweeting the pollution data are at their account @ Pigeon Air. Meet the squad.

People can follow along and tweet at them for updates on local pollution data.The backpacks detect nitrogen dioxide and ozone gases, and so far, the readings indicate the city wavers between moderate and high pollution levels A "high" level is one that's above the World Health Organization's recommendations for air quality. London's air has only been deemed fresh a few times so far.

As London's air quality is relatively bad. The city broke its annual EU air pollution limit within the first week of 2016. The Guardian reports, and also broke the annual cap during the previous years. The persistent dirty air ultimately pushed the country's supreme court to publish an action plan last year on how to deal with the crisis. Even with the plan, however, London and other cities except to exceed nitrogen dioxide levels for at least another five years.

The pigeons tweeted till Wednesday, the day they're scheduled to reach their home in a suburban area of London. After that point, 100 people will be recruited to beta test a new pollution monitor for humans to wear. HEY, but they can do a lot of cool things.. hope they continue to wear the backpacks.