Pigeon patrol: birds in London wear backpacks to monitor pollution

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Pigeon patrol: birds in London wear backpacks to monitor pollution

One of the birds serving in Pigeon Patrol

Ten pigeons are flying over London for the next two days monitoring the city's pollution levels. The birds are wearing tiny backpacks which live-tweet pollution data from their account @PigeonAir

London broke its annual air pollution limit within the firist week of January.  The backpacks can detect nitrogen dioxide and ozone gases. The backpacks detect nitrogen dioxide and ozone gases, then tweet out the readings. So far, the readings have shown moderate and high pollution levels. The air has only been deemed "fresh" a handful of times so far. 

The pigeons will tweet until Wednesday. After that, 100 people will be recruited to beta test a new human version of the pollution monitor.