Ed Jones / AFP - Getty Images

A blanket of haze hangs over the Hong Kong skyline early on April 3. A survey released at the end of 2010 by public policy think tank Civic Exchange found one-quarter of residents would like to leave Hong Kong to escape its pollution after levels reached a record high, prompting government warnings to people to avoid going out.

Hong Kong's smog problem

According to a study cited by the New York Times, declining visibility and air pollution were linked to 1,200 deaths in Hong Kong each year from 2007 to 2010.

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