<http://schema.org/about>
"Those summering in Paris can view, at a glance, just how refreshing the air they\u2019re breathing is. Using sensors from Airparif, a French air-quality monitoring"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/research-innovations/stories/giant-balloon-displays-paris-air-quality>