Research of the uncertainty in environmental risk assessment

In this paper, the classification and impact factors of the uncertainty in the Environmental Risk Assessment (ERA) are introduced. Four methods for quantitative analysis of uncertainty, i.e. transfer function method, numerical value simulation method, confidence interval method and second order matrix method, are expounded. At last, the approaches for lessening uncertainty, i.e. multiple objective programming, nonparametric approach, regression analysis and expert opinion approach are put forward.