The instrumentation placed in the terrain of the Park of Nations also allows possible residual or unexpected (accidental, not previously identified, etc.) environmental malfunctions to be detected, making it possible, in good time, to study and adopt the measures necessary to correct or eliminate these malfunctions.

The Supervision Plan covers the whole of the Park of Nations and the environmental factors such as the quality of the soil, subterranean waters, surface waters and sediments, the air, noise, geo-technology, meteorology, biological communities and diverse socio-economic aspects.

The relevance and dimension which the Parque Expo’s Environmental Supervision Plan has come to acquire has in itself justified the creation of an Environmental Supervision Centre, installed in the Cabeço das Rolas Garden, where all the information obtained in respect of the Supervision Plan is centralised, also possessing a group of mechanisms which make possible the real time consultation of the data collected in a series of devices located in the Park of Nations. The data available so far, including that of the reference situation (before the intervention of the Parque EXPO – 1993) is compiled in the Environment Information System.