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Aerosol properties were studied during an intensive airborne measurementcampaign that took place at Rotterdam in Netherlands in May 2008 within theframework of the European Aerosol Cloud Climate and Air Quality Interactionsproject (EUCAARI). The objective of this study is to illustrate seven eventsof new particle formation (NPF) observed with two Condensation ParticleCounters (CPCs) operated on board the ATR-42 research aircraft in airsectorsaround Rotterdam, and to provide information on the spatial extent of thenew particle formation phenomenon based on 1-s resolution measurements ofultra-fine particle (in the size range 3–10 nm diameter, denoted N3-10hereafter) concentrations. The results show that particle productionoccurred under the influence of different air mass origins, at different daytimes and over the North Sea as well as over the continent. The numberconcentration of freshly nucleated particles (N3-10) varied between5000 and 100 000 cm−3 within the boundary layer (BL). Furthermore thevertical extension for all nucleation events observed on the ATR-42 neverexceeded the upper limit of the BL. The horizontal extent of N3-10could not be delimited due to inflexible flight plans which could not bemodified to accommodate real-time results. However, the NPF events wereobserved over geographically large areas; typically the horizontal extensionwas about 100 km and larger

New particle formation events measured on board the ATR-42 aircraft during the EUCAARI campaign