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Nowak, D. (1995). Trees Pollute?  A "Tree Explains It All". Proceedings of the 7th National Urban Forest Conference (available online, pdf file).

Nowak, D. (1993). Plant Chemical Emissions. Miniature Roseworld 10 (1) (available online, pdf file).

Nowak, D. & Wheeler, J. Program Assistant, ICLEI. February 2006.

McPherson, E. G. & Simpson, J. R. (2000). Reducing Air Pollution Through Urban Forestry. Proceedings of the 48th meeting of California Pest Council (available online, pdf file).

McPherson, E. G., Simpson, J. R. & Scott, K. (2002). Actualizing Microclimate and Air Quality Benefits with Parking Lot Shade Ordinances. Wetter und Leben 4: 98 (available online, pdf file).

Hanson, Michael L.(1990). Urban & Community Forestry, a Guide for the Interior Western United States, USDA Forest Service, Intermountain Region, Ogden, Utah.