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<http://www.sbcapcd.org/sbc/pollut.htm>.

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<http://www.articlesbase.com/environment-articles/health-problems-caused-by-air-pollution-22606.html>.

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<http://www.epa.gov/ttn/atw/3_90_022.html>.

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<http://www.lbl.gov/Education/ELSI/Frames/pollution-health-effects-f.html>.

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