Ground based in situ observations of aps at Zeppelin mountain (Ny-Ă…lesund) (NO0042G). These measurements are gathered as a part of the following projects ACTRIS_NRT, GAW-WDCA_NRT, NILU_NRT, SIOS_InfraNOR and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: particle_number_size_distribution in pm10