In an effort to raise awareness about air pollution, Twitter put on a contest where ones of the winners was a team composed of PR agency DigitasLBi and tech startup Plume Labs. Their project involves strapping tiny air sensors to the back of domesticated racing pigeons (which return home to roost every night) and have them fly around the city. You’re then free to Tweet your location to any of the 10 birds in the project, and they’ll send you back info about ozone, nitrogen dioxide and volatile compound levels. In other words, the birds will tell you how safe it is to even breathe the air around you. Granted with only 10 birds you won’t get a very complete snapshot of the city’s pollution levels, but again, this is more about raising awareness than it is about creating an accurate network. The bird squad is known as the Pigeon Air Patrol, and they’ll fly the skies for only 3 days.