| Name | Type | Country | Components |
|---|---|---|---|
| RADO-Iasi | Observational platform | Romania | 1 |
| Risoe Research Station | Observational platform | Denmark | 1 |
| Ruisdael Observatory: Cabauw | Observational platform | Netherlands | 5 |
| Rzecin | Observational platform | Poland | 2 |
| Schmücke | Observational platform | Germany | 3 |
| Scientific Station of the Jungfraujoch, Swiss-Belgian site | Observational platform | Belgium | 1 |
| Site d’observation atmosphériques Puy de Dôme/ Opme/Cézeaux (COPDD) | Observational platform | France | 3 |
| Site Instrumental de Recherche par Télédétection Atmosphérique (SIRTA) | Observational platform | France | 4 |
| SMEAR II (Hyytiälä) | Observational platform | Finland | 4 |
| SMEAR III (Helsinki) | Observational platform | Finland | 2 |
