Sumber Gambar:
http://scipeeps.com/wp-content/uploads/2009/07/air-pollution-proevention.jpg
https://www.clpgroup.com/poweru/eng/air_quality/images/ph_airPollution.jpg
http://www.worldwatch.org/brain/images/press/news/vs05-air-pollution-deaths.jpg
http://www.chrismadden.co.uk/eco/air-pollution-illustration.jpg
http://environmentaljournalismcanada.wikispaces.com/file/view/indoor.jpg/107983275/indoor.jpg
http://www.ec.gc.ca/doc/media/m_124/brochure/images/BR_fig3_s_e.gif
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