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The holistic approach to sustainable urban planning implies using differentmodels in an integrated way that is capable of simulating the urban system. Asthe interconnection of such models is not a trivial task, one of the keyelements that may be applied is the description of the urban geometricproperties in an "interoperable" way. Focusing on air quality as one of themost pronounced urban problems, the geometric aspects of a city may bedescribed by objects such as those defined in CityGML, so that an appropriateair quality model can be applied for estimating the quality of the urban air onthe basis of atmospheric flow and chemistry equations.  In this paper we first present theoretical background and motivations for theinterconnection of 3D city models and other models related to sustainabledevelopment and urban planning. Then we present a practical experiment based onthe interconnection of CityGML with an air quality model. Our approach is basedon the creation of an ontology of air quality models and on the extension of anontology of urban planning process (OUPP) that acts as an ontology mediator.

Ontologies for the Integration of Air Quality Models and 3D City Models