The instrument for the PMx measurement (i.e. SWAM 5a instruments) gives the 24 h mass concentration average value with a high precision and reliability level, while the optical particle counter gives the suspended particulate matter daily trend, putting in evidence its trend in real time (number and granulometric size).
Such a datum, suitably integrated with the PMx information, can give fundamental indications to determine the correlation factors with the emission sources and their type.
This information make it possible to analyze special environmental conditions allowing, if needed, to identify eventual corrective activities.
This technological approach is aimed at using the OPC data for their correct functional value, that is as an integration of the PMx concentration data supplied by the Monitors.