<http://schema.org/alternativeHeadline>
"Sumatran wildfies have contributed to doubling the past air pollution record in Singapore. Schools have been closed due to the life-threatening smog in the city."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/climate-weather/stories/air-pollution-hits-record-levels-in-singapore>