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3. U.S Environmental Protection Agency, “Effects of Acid Rain”, last updated: 5/12/2012, http://www.epa.gov/acidrain/effects/health.html (accessed 14/8/14)
4. Energy and Mineral Engineering, “effect of Acid Rain on Materials, Visibility and Human Health”, https://www.e-education.psu.edu/egee102/node/1983 (accessed 14/8/14)
5. ABC Science, “what is Acid Rain”, published: 28 june 2010, http://www.abc.net.au/science/articles/2010/06/28/2938845.htm (accessed 14/8/14)
6. Conserve energy Future, “what is Acid Rain?”. http://www.conserve-energy-future.com/causes-and-effects-of-acid-rain.php (accessed 16/8/2014)
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8. Enviropedia, “Europe” acid rain, http://www.enviropedia.org.uk/Acid_Rain/Europe.php (accessed 16/8/14)
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10. Acid rain Student site, “ What causes acid rain?”, http://www.epa.gov/acidrain/education/site_students/whatcauses.html
(accessed 17/8/14)
11. Acid Rain 2014. Britannica School. Retrieved 17 August 2014, from http://school.eb.com.au/levels/high/article/3549
12. Science Daily, “Nitrogen Oxide”, http://www.sciencedaily.com/articles/n/nitrogen_oxide.htm (acessed: 22/8/14)
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14. Australian Government Department of Environemnt, “Sulphur Dioxide (SO2)”, Updated: 2005, http://www.environment.gov.au/resource/sulfur-dioxide-so2 (accessed 22/8/14)