Portland, Oregon sources

Watson, J. G., Chemical element balance receptor model methodology for assessing the sources of fine and total suspended particulate matter in Portland, Oregon, PhD Thesis, Oregon Graduate Center, Beaverton, Oregon, 1979. 

Watson, J.G., Jr., (1979) "Chemical Element Balance Receptor Model Methodology for Assessing the Sources of Fine and Total Suspended Particulate Matter in Portland, Oregon," Thesis, Ph.D., Department of Chemistry, Oregon Graduate Center, Beaverton, OR. 

Methodology For Sources of Fine and Total Suspended Particulate Matter in Portland, Oregon." Oregon Graduate Center, February 1979. 

Small amounts of the two substances can be found in the air, water, and soil. Therefore, breathing air, drinking water, and eating foods grown in soils that contain these substances can expose you to them. The background levels (when no apparent sources of pollution are present) of the two nitrophenols in air are not known. However, in one case, the level of 2-nitrophenol in the air in Portland, Oregon, was 4 parts per trillion (ppt by volume). Its level in the air in Dubendorf,... 

Receptor Models. Receptor models, by their formulation, are effective in determining the contributions of various sources to particulate matter concentrations. In classic studies, sources contributing to airborne particle loadings have been identified in Washington, D.C. (78), St. Louis (9,24), Los Angeles (7,12), Portland, Oregon (78), and Boston (79—81), as well as other areas including the desert (82). 

Source. Courtesy of Pulse Drying Systems, Inc., Portland, Oregon. 

Cooper, J. A. and J. G. Watson. Portland Aerosol Characterization Study (PACS). Application of Chemical Mass Balance Methods to the Identification of Major Aerosol Sources in the Portland Airshod. Final report Summary. Prepared for the Portland Air Quality Maintenance Area Advisory Committee and the Oregon Department of Environmental Quality. April 23, 1979. 

---