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- Clean Air World. "Vehicles and Fuels." (Nov. 16, 2010)http://www.cleanairworld.org/TopicDetails.asp?parent=24
- Environmental Protection Agency. "Particulate Matter." Oct. 28, 2010. (Nov. 11, 2010)http://www.epa.gov/pm/
- Environmental Protection Agency. "Plain English Guide to the Clean Air Act: Cars, Trucks, Buses, and 'Nonroad' Equipment." Aug. 29, 2008. (Nov. 13, 2010)http://www.epa.gov/air/caa/peg/carstrucks.html
- NOAA Magazine. "Summer Weather Can Promote Poor Air Quality - NOAA's Air Quality Forecast Guidance Helps Predict It." May 14, 2007. (Nov. 15, 2010)http://www.magazine.noaa.gov/stories/mag228.htm