cc-by-4.0Kulmala, Markku2025-04-292020-10-022020-10-02https://datakatalogi.helsinki.fi/handle/123456789/5556This dataset contains the following data: -Doppler lidar measurements from Hyytiälä, Finland (May 1-2, 2017) -Ion spectrometer data from Hyytiälä, Finland (May 2, 2017) -Airborne measurement data from southern Finland using an instrumented Cessna 172 (several campaigns between 2011-2018) -New particle formation event classifications from Hyytiälä, Finlanddataset