An NAS study released July 08 shows that if you live in north of the Huai River in China, you can expect to live about 5.5 years less than those to the south. Air pollution, specifically particulate matter from burning coal, is the primary culprit.
Jul 18, 2013 Guardian
In Beijing, the level of air pollution is the highest the monitors at the U.S. embassy have ever recorded since put in place in 2008. The pollution results from a combination of weather conditions and particulate matter - most from coal burning.
Jan 15, 2013 The New York Times - Environment