Ground based in situ observations of ammonia at Zeppelin mountain (Ny-Ålesund) (NO0042G) using filter_3pack. These measurements are gathered as a part of the following projects AMAP, CAMP, EMEP, NILU and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ammonia in air (mass_concentration_of_ammonia_expressed_as_nitrogen_in_air)