Data from PICNIC campaign taking place from 2018-03-25 - 2018-10-25 at Puy de Dôme. This dataset represents the INP concentration measured by the PINE instrument. The time is UTC+2. Parts of this dataset have already been published in a previous publication titled "The Puy de Dôme ICe Nucleation Intercomparison Campaign (PICNIC): comparison between online and offline methods in ambient air" by Lacher et al. under https://dx.doi.org/10.35097/1876.