Figure 6

Differences between undried and dried particles measured by OPS, (a,b): the size distribution of undried/dried particles in 2015-05-30 samples, (c,d): the size distribution of undried/dried particles in 2015-05-31 samples; A dryer was added for 20–30 minutes alternatively to control wet/dry inlet. The circles represent the mean values of particle volume concentrations, and the solid represents the range (Max and Min) of particle volume concentrations for hundreds of samples on that day as a concise view.