The geoservice is fed by a database deriving from various information sources. The data in consultation are: - the results of EMC monitoring from power lines. Measurement points carried out by ARPA of the levels of low-frequency electric and magnetic fields generated by power lines. The measurements are carried out with inspections by operators equipped with portable instrumentation or through control units that detect the information continuously. The level of the electric field generated by a high voltage line remains approximately constant over time, so that for each point the maximum level of the measured electric field is reported (where found as significant). The level of the magnetic field, on the other hand, varies over time, depending on the current flowing in the line. For this reason, for each point of the measurements prior to 2015, a general indication of a range of magnetic field levels is provided in which the real values fall. For continuous measurements since 2015, the maximum median value of the magnetic field over 24 hours is reported, while for spot measurements from 2015, the instantaneous magnetic field value is reported. More detailed information on temporal variability and on the values actually measured are available upon request to dip.rischi.fisici.tecnologici@arpa.piemonte.it. Information is also provided on the date and municipality in which the measurement was carried out and (where available) on the code of the electricity line to which the measurement refers. The measurements are divided into: - Spot measurements since 2015 - Continuous measurements since 2015 - Measurements prior to 2015 (spot and HV lines) - the areas affected by the magnetic field from power lines. Arpa Piemonte provides technical support and carries out verification activities on the evaluation of the buffer zones of power lines, within the ambit defined by Law 36/2001, by the DPCM 08/07/2003 and by the DPCM 29/05/2008. The buffer zones are those volumes around the conductors of the line, outside of which compliance with the quality objective on the magnetic field (3 µT) is guaranteed. The design of new settlements (or the modification of intended use) with the possible prolonged stay of people near existing power lines must be done outside the power line buffer zone. The set of rules cited above provides that the managers of the power lines provide the extent of these bands to the competent authorities, and in particular to the municipality, so that the latter integrates it into urban planning instruments. Arpa's role, as a technical body in charge of control activities, is to verify what is provided by the manager. The standard also provides that, in the first instance, the Distance of first approximation (Dpa) is calculated, i.e. that 'distance, in plan view on ground level, from the projection of the center line which guarantees that each point whose projection on the ground is from the projection of the center line more than Dpa is outside the buffer zones'. In practice, for buildings outside the corridor defined by the DPA, no further verification is necessary, while for buildings inside the corridor, it is necessary to verify that the height of the building is such as to keep it outside the volume of the buffer zone, i.e. that volume around the conductors outside of which the quality objective is respected. This service contains a general indication of the corridors defined on the territory, taking into account the Dpa of the high and very high voltage lines, both taken individually and considering the overlapping of the magnetic field in the presence of two or more lines. - the development of power lines with the criticality score of the municipalities which provides an indication of the density and the number of km of power lines for each municipality in Piedmont (the length of the power lines that cross the inhabited areas of each municipality in Piedmont is counted ).- Population exposed to the magnetic field from high voltage lines: indication of the number of people exposed to the magnetic field generated by high voltage lines, classified by level of exposure (non-significant, limited, medium, high exposure)
