The Italian Atmospheric Rome joinT SupersitE (ARTE) National Facilities includes two experimental sites located in the metropolitan area of Rome: 

• The CNR-ISAC Rome Atmospheric Supersite (CIRAS, https://www.isac.cnr.it/it/infrastrutture/ciras) located in the semi-rural foot-hill area of Tor Vergata (41.88°N, 12.68°E, 107 m ASL). This site is operated by the Institute of Atmospheric Sciences and Climate with the participation of the Institute of Marine Sciences. 
•  BAQUNIN (Boundary-layer Air Quality Using Network of Instruments, https://www.baqunin.eu/) urban site located at “Sapienza” University, in the city center (41.90°N, 12.51°E and 75 m ASL). This site is operated by La Sapienza University of Rome. 

These two sites are located in an environment resulting of particular relevance for atmospheric pollution monitoring and characterization. In addition, the city of Rome is located not far from the Tyrrhenian coasts and exposed to sea-breeze circulation and to extreme aerosol events, as Saharan dust is frequently transported through the Mediterranean Sea. Rome is also subject to energetic meteorological events, especially during autumn and winter periods. This configuration is unique in Europe. Thus, the synergy of these two sites gathers a unique ensemble of advanced instrumentation for atmospheric remote-sensing and for the validation of atmospheric composition satellite data. 

Current observations are directed towards the study of atmospheric composition, boundary layer dynamics, meteorology and the study of precipitation. 

Observational methodologies include remote sensing from the ground and from satellites, atmospheric composition and precipitation measurements from both stationary and mobile means. Lidar, Radar and Sodar instrumentation developed by ISAC, ISMAR and La Sapienza is used in parallel with advanced commercial instrumentation. 

Validated products and/or ‘quick-looks’ are provided to both national and international networks (e.g., Aeronet, E-Profile, Earlinet, NDACC, Skynet, Alice-net, ArpaLazio-net) and for the validation of satellite data (e.g., GPM, EarthCare). 

Within ACTRIS, ARTE fulfils the requirements for the Aerosol Remote Sensing (ARS) component (https://actris-nf-labelling.out.ocp.fmi.fi/facility/81), for which the labelling procedure will start at the end of 2023. The other components such as ‘Aerosol in-situ, Trace Gases Remote Sensing and Cloud Remote Sensing’ will be included in the coming years.