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http://media.hamptonroads.com/cache/files/images/6161.jpg
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www.census.gov
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http://www.sdapcd.org/air/forecasts/otoday.html
www.census.gov
http://www.livestrong.com/article/124080-reasons-asthma/
http://libguides.sph.uth.tmc.edu/chronic_disease_data
http://www.aafa.org/display.cfm?id=8&cont=6
http://www.cdc.gov/asthma/survey/YRBS.pdf
http://www.nhlbi.nih.gov/health/health-topics/topics/asthma/
http://www.aaaai.org/about-the-aaaai/newsroom/asthma-statistics.aspx
http://www.globalasthmareport.org/?q=global-impact/economic-burden-of-asthma
http://www.buzzle.com/articles/ways-to-prevent-air-pollution.html
http://www.asthma.ca/adults/about/triggers.php