The Cosmics Leaving Outdoor Droplets (CLOUD) experiment uses a special cloud chamber to study the possible link between galactic cosmic rays and cloud formation. Based at the Proton Synchrotron (PS) at CERN, this is the first time a high-energy physics accelerator has been used to study atmospheric and climate science. The results should contribute much to our fundamental understanding of aerosols and clouds, and their affect on climate.

CLOUD-MOTION (funded by the EU MSCA programme) and CLOUD16 (funded by BMBF) are current projects for participating in this cutting-edge research.