Wood smoke risk assessment: defining the questions.

Risk assessment provides a framework for combining and evaluating scientific data on source-to-health effects for contaminants that could potentially affect the health of human populations. It utilizes an integrated approach to hazard identification, dose response, exposure assessment, and risk characterization. Since the range of potential exposure scenarios is considerable, given the complexity of wood-smoke sources and emissions, there is a need for defining the critical characteristics for the key parameters leading to adverse health outcomes. During the International Biomass Smoke and Health Effects (IBSHE) conference at the University of Montana (August 2007), the breakout group entitled "Risk Assessment: Defining the Questions" was tasked with evaluating the current state of the science in regard to risk assessment involving biomass smoke exposure. As a result of these discussions, important data gaps and future research questions were identified that are reported in this article.