1. EIA, U.S. Energy Information Administration, Eco world, 6.18.2013, 〈http://www.statisticbrain.com〉.
2. World Health Organization. Inter national Agency for Research on Cancer, IARC: Outdoor air pollution a leading environmental cause of cancer Deaths, IARC, 150 Course Albert Thomas, 17 Lyon Cedex 08 the 69372nd, France, 17 October; 2013.
3. World Health Organization, WHO, Air Pollution, 〈http://www.who.int〉
4. Environmental Protection Agency, EPA, Air Pollution, 〈http://www.epa.gov〉
5. Aerosol properties and processes;Ghan;Bull Am Meteorol Soc,2007