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2. US EPA, The Inside Story: A Guide to Indoor Air Quality, US Environmental Protection Agency and the United States Consumer Product Safety Commission, Office of Radiation and Indoor Air (6604J), EPA Document #402-K-93-007, 1995; National Center for Environmental Publications, Cincinati, OH. available from http://www.epa.gov/iaq/pubs/insidest.html .
3. UNEP, Urban Air Pollution, UNEP/GEMS Environment Library No. 4, 1991.
4. T. Godish, Air Quality, 3rd ed., Lewis, Boca Raton, FL, 1997.
5. K. Wark, C. F. Warner, and W. T. Davis, Air Pollution: Its Origin and Control, Addison-Wesley longman, Reading, MA, 1998.