Source: Earth Observatory
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Air Pollution in China: Real-time Air Quality Index Visual Map. Accessed January 14, 2013.
China Air Daily.Accessed January 14, 2013.
U.S Embassy Beijing Air Quality Monitor. Accessed January 14, 2013.
Beijing warns residents after off-the-charts smog (Associated Press, 2013, January 14)
New Map Offers a Global View of Health-Sapping Air Pollution. (NASA 2010, September 22)
Satellites Map Fine Aerosol Pollution Over China. (NASA Earth Observatory 2012, March 23)
China allows media to report alarming air pollution crisis.(NYT, 2013, January 14)
China’s air pollution problem slideshow (Yahoo News 2013, January 14)