1. “Fact sheet: EPA’s Revised Particulate Matter Standards,” U.S. Environmental Protections Agency, Office of Air Quality Planning and Standards, Office of Air and Radiation, July 1997.
2. “Air quality criteria document for particulate matter,” U. S. Environmental Protection Agency. U. S. Government Printing Office: Washington, DC, 1996; EPA/600/P-95/001/1aF.
3. “National air quality and emissions trends report, 1994,” U. S. Environmental Protection Agency. U. S. Government Printing Office: Washington, DC, 1995; EPA/454/R–95–014.
4. Miller, J., U.S. Environmental Protection Agency, personal communication, 1996.
5. Wolff, George T. “On a NOx-focused control strategy to reduce ozone,”J. Air & Waste Manage. Assoc. 1993,43.