Intel Labs recently demonstrated new technology called 'Common Sense': a small device that measures carbon dioxide, carbon monoxide and ozone levels. Basically a portable air quality meter for consumers. By integrating GPS and GSM protocols, the device will be able to connect the readings of air quality to locations or GPD coordinates.

Currently the device is about as large as a mobile phone, but the idea is to eventually make 'Common Sense' small enough to fit in smartphones and mobile phones. Sounds like an awesome idea for a 'crowdsourced' global map of  air quality!
via Cnet