Fig. 7

Number of dissolution/crystallization cycles of NaCl per season over one year in a rural (Melle, Belgium, 2016) or urban (central Ghent, Belgium, 2016) environment considering an average time scale between 1 min and 24 h when the RH threshold of 75.5% (representing pure NaCl) or 65.5% (representing NaCl in a mixture) is surpassed (x-axis in log scale)