Fig. 7From: Long-term trends of black carbon and particle number concentration in the lower free troposphere in Central EuropeThe detailed information for the airmass clusters at ZSF and JFJ. a, b The mean trajectories of the two airmass clusters at ZSF and JFJ; c, d the monthly occurrence of the two airmass clusters at ZSF and JFJ; e, f the statistics (mean, 5th, 25th, 75th, and 95th percentiles) of the eBC mass concentration for the two airmass clustersBack to article page