Stations
Ukkel (50.5°N, 4°E)
Jungfraujoch (46.5°N, 8°E)
Ile de La Réunion (21°S, 55°E)
Bujumbura (3°S, 29°E)
Remote sensing instruments
Brewer spectrometers
CIMEL sunphotometers
Fourier-transform infrared spectrometers
MAXDOAS spectrometers
In situ measurement instruments
Lidar ceilometer
Aethalometer
Nephelometer