PM2.5 particulate in China and Taiwan

Recent Economist magazine has an article about China's pollution. I compared its 2012 data of PM2.5 particulates with cities in Taiwan in late December last year. Any PM2.5 number more than 10 ugram/m^3 is unhealthy. 北京 and 河南 are the worst. 台東, 恆春,青海, 西藏, 新疆 are all Xanadu.