<http://schema.org/headline>
"Think US Clean Air Regulations Don't Work? Check Out Which Cities in the World Are Dirtiest"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/energy-policy/think-us-clean-air-regulations-dont-work-check-out-which-cities-in-the-world-are-dirtiest.html>