On the flip side this is a good place in China to breathe. ^
DingHu Mountain (Guangdong) 20 km east of ZhaoQing, possibly the highest concentration of oxygen per cubic meter of any place in China.
In 1979, Dinghu Mountain National Nature Reserve was included in the International Man and Biosphere Reserve Network of the UNESCO as a global conservation spot for the research of ecosystem in tropical and subtropical forest.
http://blufiles.storage.live.com/y1p...Q5kSRC7-Fu5nw4
added bonus: There is a cell tower on the top of the mountain, so excellent mobile connection!