The main goal of any society is to meet environmental standards with respect to basic economic requirements, despite all the problems it faces. After solving the major problems concerning the harmonization of environmental and economic goals, these goals could be adequately introduced in a mathematical model. In recent years, the economic theory of decision has been devoted to the methods of multi-criteria optimization of these problems. Minimum costs are regarded as an economic objective, and minimum emission as an environmental objective. In this paper we will emphasize the importance of introducing economic and environ- mental goals in models that deal with this problem. The implementation of successful economic policy is based on the optimal solutions of environmental modelling.