The purpose of this feasibility study is to find out the interests in and requirements for the development of a Swedish Integrated Assessment Model (IAM) based on the Regional Air Pollution Information and Simulation model (RAINS) or the Greenhouse Gas and Air Pollution Interactions and Synergies model (GAINS). This study should also make clear the possibilities and constraints of a national model as well as discuss different applications of such a model. The purpose of this feasibility study is to find out the interests in and requirements for the development of a Swedish Integrated Assessment Model (IAM) based on the Regional Air Pollution Information and Simulation model (RAINS) or the Greenhouse Gas and Air Pollution Interactions and Synergies model (GAINS). This study should also make clear the possibilities and constraints of a national model as well as discuss different applications of such a model.