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GPS Pigeons Monitor Air Quality
http://www.gpsreview.net/pigeonblog-gps-pigeons-monitor-air-quality/
Hemamali T
Hemamali T May 05, 2013
GPS Pigeons Monitor Air Quality
http://www.gpsreview.net/pigeonblog-gps-pigeons-monitor-air-quality/

I've seen these sensors...

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