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9 household items dirtier than a toilet seat
Take a look at some of the world's most polluted cities, as ranked and compiled by Time, the Blacksmith Institute and ABC Environment.
Severe pollution is once again choking Shanghai and other cities in China, disrupting hundreds of flights and forcing schools to close. China is home to some of the world's most polluted cities -- take a look at some of the others.
As the lava continues to flow through vegetation on the Big Island, University of Hawaii scientists and students have developed a model to track the smoke and where it goes.
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