1. http://www.statssa.gov.za/census01/html/default.asp
2. http://www.sahealthinfo.org/bod/causeofdeath2008.pdf
3. Cape Town Air Quality Monitoring Laboratoryhttp://www.capetown.gov.za/en/Water/PublishingImages/AQM_2.jpg
4. National Environmental Management: Air Quality Acthttp://www.polity.org.za/article/national-environmental-management-air-quality-act-392004-proposed-regulations-regarding-the-phasing-out-and-management-of-ozone-depleting-substances-in-the-republic-of-south-africa-gazette-no-33925-notice-12-2011-01-14