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In situ measurement of cloud particle number size distribution was made using a fog-monitor instrument (DMT FM120) at Mt. Zeppelin, Ny-Alesund, Svalbard Island (78.93N, 11.88E, 478m a.s.l.). This data set contains ten-minute average of number size distribution (dN/dlog_r) of cloud particles with radii between 1.5 and 23.5 um. Each data set contains one-month data. No data is available between August and October 2014.