| Name | Type | Country | Components |
|---|---|---|---|
| Barcelona Aerosol Supersite | Observational platform | Spain | 2 |
| Basic Environmental Observatory Moussala - BEO Moussala | Observational platform | Bulgaria | 1 |
| Belsk | Observational platform | Poland | 2 |
| Beromuenster | Observational platform | Switzerland | 1 |
| Birkenes | Observational platform | Norway | 1 |
| Bremen | Observational platform | Germany | 1 |
| Cape Verde Atmospheric Observatory | Observational platform | Germany | 4 |
| CERNESIM | Atmospheric simulation chamber | Romania | 2 |
| ChAMBRe | Atmospheric simulation chamber | Italy | 2 |
| Chambre de simulation atmosphérique à irradiation naturelle d’Orléans (HELIOS) | Atmospheric simulation chamber | France | 2 |
