At the request of the Meteorology and Air Quality Technical Research Committee of AOSERP, a literature survey of existing air quality models which may have possible applications in the air quality prognam of the AOSERP study area was conducted. In addition to reviewing the published literature, several private companies and governmental agencies with available models were contacted as were individuals working in the field. Models which are available for review are described in terms of their applicability, scientific rigor, advantages, and disadvantages. Models which can deal with complex terrain features are recommended in applications of air quality problems in the Alberta Oil Sands. A user's requirements survey was conducted in order to determine the extent to which existing models can meet the requirements of users. Since no single existing model can meet the requirements of all users, a hierarchy of models is recommended for air quality problems in the oil sands.