1. WHO. Health relevance of particulate matter from various sources. Report on a WHO workshop Bonn, Germany 26–27 March 2007. http://www.euro.who.int/data/assets/pdf_file/0007/78658/E90672.pdf [accessed June 2010].
2. Health Effects Institute. Health Effects of Outdoor Air Pollution in Developing Countries of Asia: A Literature Review. Special Report 15, 2004.
3. Health effects of fine particulate air pollution: lines that connect;Pope;J Air Waste Manage Assoc,2006
4. U.S. EPA. Integrated Science Assessment for Particulate Matter (Final Report). U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-08/139F, 2009. http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=216546#Download [accessed 15 June 2013].