The project complements and develops previous ISIS projects implemented in previous years from OPE 2007-2013, PO 2, which carried out the renewal of the State Network of Imission Monitoring and partly also technicians in laboratories and SIMIR 1 and 2 implemented in 2017-2018 from OPE 2014-2020, PO 2. The SIMIR 3 project aims at adding new instruments that are used to determine the concentrations of pollutants in the air, to ensure the quality of calibrations and to supplement the measuring technology for special measurements.