The Cabauw Intercomparison Campaign of Nitrogen Dioxide measuring Instruments (CINDI) took place in Cabauw, The Netherlands, in June and July 2009. CINDI is a CEOS, GEOMON, ACCENT-AT2 and NDACC initiative. The main objective of this campaign was to intercompare the NO2 measuring instruments that can be used for validation of tropospheric NO2 from satellites. The campaign results in an estimate of the accuracy of the NO2 tropospheric columns and profiles for the participating instruments under different atmospheric conditions (clouds/aerosols) and viewing geometries. Many different in-situ and remote sensing instruments have participated. Apart from NO2, other parameters were measured and intercompared, among which O3, aerosol, HCHO, CHOCHO, and BrO.
