Ice nucleating particles (INPs) are important atmospheric particles influencing the formation of ice in clouds. Their sources and atmospheric concentrations currently are subject of plenty of research. The here provided data on INPs (Ice Nucleating Particles) were derived from particles collected onto filters for two separate projects: 1) Sampling during two austral summers 2020/2021 and 2021/2022, for the CLIMB project (How do aerosol-CLoud Interactions influence the surface Mass Balance in East Antarctica?) at the Belgian Princess Elisabeth station (PES), a zero emission station, installed on a mountain ridge of Utsteinen Nunatak. 2) Sampling during a field campaign during PI-ICE (Polar atmosphere ice-ocean Interactions: Impact on Climate and Ecology) west of and on the northern Antarctic Peninsula in January until March 2019.Filters were analyzed at the TROPOS ice-lab in Germany, using well established off-line techniques. Detailed information on sampling and data evaluation are given in the abovementioned publication which this data-set accompanies. Measured frozen fractions are provided for samples and field blinds, INP concentrations are provided for samples both with and without subtracting the background.

1a) PI-ICE_samples-and-volsQuartz-fiber-filters were evaluated by examining filter punches in PCR-trays filled with ultra-clean water. The fraction of each filter stance surface area (1mm in diameter) to the total filter surface area (144mm in diameter) is 0.000051205.The respective equation is given in the supplemental information of the related manuscript, equation 2.---1b) PES_samples-and-volsPolycarbonate-filters were evaluated in these cases, with INPs being washed off the filters and with an additional dillution step for LINA measurements.To obtain the volume of sampled air examined per droplet in these cases, one needs the volume of the washing water (V_water) and the volume of an examined droplet (V_droplet).The respective equation is given in the supplemental information of the related manuscript, equation 2.---INDA:V_droplet = 50 * 10^-9 m^3V_water = 6.21 * 10^-6 m^3LINAV_droplet = 1 * 10^-9 m^3V_water = 3 * 10^-6 m^3