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Works Cited. “Air Pollution.” Photograph. Lawrence Berkley National Laboratory. n.p . n.d. Web. 14 April 2012.
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Works Cited • “Air Pollution.” Photograph. Lawrence Berkley National Laboratory. n.p. n.d. Web. 14 April 2012. • Columbia University’s Mailman School of Public Health. “Air Pollution from Trucks and Low-Quality Heating Oil May Explain Childhood Asthma Hot Spots.” Science Daily, 27 March 2012. Web. 14 April 2012. • “Discovery Channel Videos: Assignment Discovery Shorts II: Water Pollution.” 25 July 2011. Discovery. Online Video Clip. 14 April 2012. • Gresham, Tom. “Brief Introduction to Water and Soil Pollution.” National Geographic Green Living. Demand Media, Inc., 2012. Web. 14 April 2012. • “Ground Level Ozone.” United States Environmental Protection Agency. n.p. 04 April 2012. Web. 14 April 2012.