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. We compared observations of aerosol particle formation and growth indifferent parts of the planetary boundary layer at two differentenvironments that have frequent new particle formation (NPF) events. Insummer 2012 we had a campaign in Po Valley, Italy (urban background), and inspring 2013 a similar campaign took place in Hyytiälä, Finland(rural background). Our study consists of three case studies of airborne andground-based measurements of ion and particle size distribution from∼1 nm. The airborne measurements were performed using aZeppelin inside the boundary layer up to 1000 m altitude. Our observationsshow the onset of regional NPF and the subsequent growth of the aerosolparticles happening almost uniformly inside the mixed layer (ML) in bothlocations. However, in Hyytiälä we noticed local enhancement in theintensity of NPF caused by mesoscale boundary layer (BL) dynamics. Additionally, ourobservations indicate that in Hyytiälä NPF was probably also takingplace above the ML. In Po Valley we observed NPF that was limited to aspecific air mass.

Zeppelin-led study on the onset of new particle formation in the planetary boundary layer