Air Quality Control Networks include several measuring sensors of environmental parameters (SO2, NOX, CO, PM10, etc.) that, scattered throughout cities or industrial areas, provide data about the state of air quality.
Air quality control stations
These Networks are usually made of several stations that are thermally isolated to preserve the working conditions of the analysers and auxiliary systems inside, and that are prepared to resist weather conditions. Inside they have automatic pollutant gas analysers whose characteristics may change according to the area: urban, industrial, etc.
Each station has a data acquisition system, usually with a data continuous registration, and transmits those data to a Control Centre, which, in case it is a private network, would transmit the data to the Autonomic Public Administration.
The measuring parameters most frequently used at the stations are: SO2, SH2, NO2/NO/NOX, CO, O3, BTX, PM10 and PM2,5. Other less frequent parameters can also be measured, such as cadmium, lead, etc. Usually, not all parameters are measured at the same time, but, depending on the particular area some are selected.
Air Quality Control Networks can be either public or private.
The Autonomous Communities and Local Councils, according to the competences established by the law, are responsible for these networks.
Nowadays, air quality control networks in Spain have more than 600 on-site measuring stations all throughout the country. The number is analysers is more than 4.000.