wow , just today I was thinking about similar idea. Crowd sourcing air pollution. Adding some small device to your smartphone(andruino with android) that sniff

wow , just today I was thinking about similar idea. Crowd sourcing air pollution. Adding some small device to your smartphone(andruino with android) that sniffs the air and analyzes the pollutants ,etc. Then sends it back to the server and can visualize it. About a thousand users in a big city would be enough . Not only just to see it on the web, but for example city traffic lights can divert cars depending on the polluted area,deciding where to buy/rent a house