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. The multiwavelength Mie–Raman–fluorescence lidar of the University of Lille has thecapability to measure three aerosol backscattering coefficients, two extinctioncoefficients and three linear depolarization ratios, together withfluorescence backscattering at 466 nm. It was used to characterize aerosolsduring the pollen season in the north of France for the period March–June2020. The results of observations demonstrate that the presence of pollengrains in aerosol mixture leads to an increase in the depolarization ratio.Moreover, the depolarization ratio exhibits a strong spectral dependenceincreasing with wavelength, which is expected for the mixture containingfine background aerosols with low depolarization and strongly depolarizingpollen grains. A high depolarization ratio correlates with the enhancement ofthe fluorescence backscattering, corroborating the presence of pollengrains. Obtained results demonstrate that simultaneous measurements ofparticle depolarization and fluorescence allows for the separation of dust, smokeparticles and aerosol mixtures containing the pollen grains.

Mie–Raman–fluorescence lidar observations of aerosols during pollen season in the north of France