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Abstract. The application of a new particle collection system (PCS) developed in-houseand operated on board a commercially available multicopter unmanned aerial vehicle(UAV) is presented as a new unmanned aerial system (UAS) approach for in situmeasurement of the concentration of aerosol particles such as pollen grainsand spores in the atmospheric boundary layer (ABL). A newly developedimpactor is used for high-efficiency particle extraction on board themulticopter UAV. An airflow volume of 0.2  m3  min −1 through theimpactor is provided by a battery-powered blower and measured with an on-boardmass flow sensor. A bell-mouth-shaped air inlet of the PCS is arranged andoriented on the multicopter UAV to provide substantial isokinetic samplingconditions by advantageously using the airflow pattern generated by thepropellers of the multicopter UAV. More than 30 aerosol particle collection flights were carried out nearTubingen in March 2017 at altitudes of up to 300  m above groundlevel (a.g.l.), each with a sampled air volume of 2  m3 . Pollengrains and spores of various genera, as well as large ( >20 µ m)opaque particles and fine dust particles, were collected, and specificconcentrations of up to 100 particles per m3 were determined byvisual microscopic analysis. The pollen concentration values measured withthe new UAS match well with the pollen concentration data published by theStiftung Deutscher Polleninformationsdienst (PID) and by MeteoSwiss. Amajor advantage of the new multicopter-based UAS is the possibility of theidentification of collected aerosol particles and the measurement of theirconcentration with high temporal and spatial resolutions, which can be usedinter alia to improve the database for modelling the propagation of aerosolparticles in the ABL.

A new multicopter-based unmanned aerial system for pollen and spores collection in the atmospheric boundary layer