Clearing the air: Is our air clean enough? (1997, August). Consumer Reports, pp. 36-38.
2.
Coyle, J. (1997, September). Anatomy of a victory: Club cheers cleaner air. The Planet, 4(7). Retrieved August 12, 1998, from the World Wide Web: http://www.sierraclub.org/planet/199709/air.html.
3.
Environmental Protection Agency (EPA) . (1997, September). EPA's updated clean air standards: A common sense primer. Washington, DC: Author. Retrieved August 12, 1998, from the World Wide Web: Wysiwyg://28/http://www.epa.gov/oar/primer.
4.
Lashof, J. C. , Banta, H. D., Gough, M., Fensterstein, R. J., Gelband, H., Cwalina, V., Gayheart, S., Kenney, N. L., & Finney, M. I. (1981). Health and life sciences division of the U.S. OTA: Assessment of technologies for determining cancer risks from the environment. Washington, DC: Office of Technology Assessment.
5.
Sierra Club . (1997, May). Club counters industry's air attacks. The Planet, 4(4), 1.
6.
Sierra Club . (1998, September). Three stages of the clean air act. The Planet, 5(7). Retrieved August 12, 1998, from the World Wide Web: http://www.sierraclub.org/planet/199807/air.html.