The natural ventilation potential (NVP) is the possibility to ensure an acceptable indoor air quality by natural ventilation only. The passive cooling potential (PCP) is the possibility to ensure an acceptable summer comfort using natural ventilation. NVP and PCP hang on many conditions depending on the site (outdoor air quality, outdoor air temperature and moisture, outdoor noise, local winds or global wind and urban structure, etc.) or on the building (indoor pollutant sources, indoor heat sources and stored heat, indoor air quality requirements, position and size of ventilation openings, indoor temperature, orientation of building, internal air path distribution, etc.) These potentials are expressed as a list of quantitative and qualitative characteristics of the site or the building, based on available input data. No detailed modelling is required for this assessment. The contribution presents the method developed to assess the NVP, and to represent it using geographically referenced information.