Measurements of a wide spectre of atmospheric constituents, both related to pollution at all scales, climate and the stratospheric ozone layer, have been a central task for NILU for several decades.
These are related to several international monitoring and environmental assessment programmes, such as EMEP, AMAP, NDSC, GAW and AGAGE. Today, NILU runs continuous observation and monitoring programmes at three observatories poleward of both Polar circles: