Just read an article about how poor the air quality in China. It's so bad that flights have been cancelled and some factories have agreed to shut down until the air quality improves. The government is also urging people to stay indoors and they are cancelling PE classes in certain areas. You can read the entire article here: http://www.latimes.com/news/world/worldnow/la-fg-wn-china-air-pollution-hits-record-levels-20130113,0,1115890.story