| Name | Type | Country | Components |
|---|---|---|---|
| Aarhus University Research on Aerosols smog chamber facility (AURA) | Atmospheric simulation chamber | Denmark | 1 |
| ACTRIS ICOS collocated station | Observational platform | Poland | 1 |
| ACTRIS-Poland Mobile LAB | Mobile platform | Poland | 1 |
| Aerosol, cluster and trace gas laboratory (Helsinki) | Laboratory platform | Finland | 2 |
| Aerosol from Ground to Cloud Mobile Experiment (ACME) | Mobile platform | Germany | 2 |
| Aerosol Interaction and Dynamics in the Atmosphere (AIDA and AIDA-dynamic) | Atmospheric simulation chamber | Germany | 2 |
| Athens Supersite Demokritos | Observational platform | Greece | 1 |
| Athens Supersite NOA | Observational platform | Greece | 2 |
| Athens Supersite NTUA | Observational platform | Greece | 1 |
| ATMOSLAB | Mobile platform | Romania | 3 |
