Published in Health and Medicine Week, January 24th, 2005
"Ambient air samples collected from five monitoring sites in Portland, OR during July 4999 to August 2000 were analyzed for 43 hazardous air pollutants (HAP). HAP concentrations were compared to carcinogenic and non-carcinogenic benchmark levels. Carcinogenic benchmark concentrations were set at a risk level of one-in-one-million (1x10-6)," scientists writing in the Journal of Environmental Management report.
"Hazard ratios of 1.0 were used when comparing HAP concentrations to non-carcinogenic benchmarks. Emission sources (point, area, and mobile)...
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