| | References: - American Lung Association. 2002. State of the Air.
- Crutzen, Paul J. 1998. How the atmosphere keeps itself clean and how this is affected by human activities. Pure and Applied Chemistry, Vol. 70, No 7, pp. 1319-1326.
- Fishman, Jack. 2002. Tropospheric Ozone, in Handbook of Climate, Weather, and Water: Chemistry, Impacts and Applications, T.D. Potter and B. Colman, editors. (New York: Wiley, New York) pp. 47-59.
- Marenco, Alain; Gouget, Hervé ; Nédélec, Philippe; and Pagés, Jean-Pierre. 1994. Evidence of a long-term increase in tropospheric ozone from Pic du Midi data series-Consequences: Positive radiative forcing. Journal of Geophysical Research. Vol. 99, No. D8, pp. 16617-16632.
- U.S. Environmental Protection Agency. 1997. EPA's Revised Ozone Standard.
- U.S. Environmental Protection Agency. 2002. Ground Level Ozone
- U.S. Environmental Protection Agency. 1999. Updated Air Quality Standards.
- U.S. National Institute of Environmental Health Sciences (NIEHS) 2000. New Research Results.
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