global annual death toll from filthy urban air at 1.3 million.

Failure to force aging buses and trucks off Hong Kong’s streets is a key cause of air pollution that results in more than 3,000 premature deaths a year, according to Civic Exchange, a think tank.
 
“People normally don’t realize that air pollution can cause cancer, heart and respiratory diseases,” said Carlos Dora, coordinator at the Geneva-based health agency’s Department of Public Health and Environment, who puts the global annual death toll from filthy urban air at 1.3 million. “Those are the diseases that really are the big, big plague.”

As Chief Executive Donald Tsang steps down after seven years in office, he leaves a city that boasts the world’s most valuable stock exchange, hosted three of the five biggest initial share sales in history, and is the best place on the globe for business, a new gauge by Bloomberg Rankings shows. Blotting the record is another superlative: Hong Kong, the most polluted international financial center. 

New York, London, Tokyo and Singapore all have cleaner air and more ambitious improvement targets, according to WHO data and the city governments’ websites. As China opens its economy, removing the capital controls that led investors to use Hong Kong as a proxy for Chinese growth, pollution risks undermining Tsang’s economic successes.