| Name | Type | Country | Components |
|---|---|---|---|
| Chambre de simulation atmosphérique à irradiation naturelle d’Orléans (HELIOS) | Atmospheric simulation chamber | France | 2 |
| CIAO | Observational platform | Italy | 4 |
| CIAO Mobile Facility | Mobile platform | Italy | 2 |
| CMN-PV | Observational platform | Italy | 4 |
| Copenhagen University; Photochemical reactor | Atmospheric simulation chamber | Denmark | 1 |
| Cyprus Atmospheric Observatory (CAO) | Observational platform | Cyprus | 1 |
| Cyprus Atmospheric Remote Sensing Observatory CARO | Observational platform | Cyprus | 2 |
| Dushanbe, Tajikistan | Observational platform | Germany | 1 |
| ESAt - El Arenosillo | Observational platform | Spain | 1 |
| EUPHORE | Atmospheric simulation chamber | Spain | 2 |
