Radioactivity in the atmosphere

Concentration of aerosol-bound radioactivity in outdoor air at 6 stations operated by the Environmental Radioactivity Section URA of the Federal Office of Public Health (FOPH). The filters of the high-volume aerosol collectors are changed weekly and then analyzed using gamma spectrometry (HPGe). The latest available measured values are shown in micro-becquerels per cubic metre (µBq/m3).