<http://schema.org/about>
"We've been hearing about the idea of putting air quality sensors in cell phones for a few years now, with the purpose of scientists using our cell phones as a crowd-sourced way of gathering as much"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/android-app-measures-air-pollution-using-cell-phones-camera.html>