Aerosol concentration measurements and correlations with air mass trajectories at the Pierre Auger ObservatoryM. I. Micheletti, K. Louedec, M. Freire, P. Vitale and R. D. PiacentiniEur. Phys. J. Plus, 132 6 (2017) 245DOI: https://doi.org/10.1140/epjp/i2017-11503-0