Fig. 6

Optical particle size distributions (experiment 2). a Particle mass size distribution at time intervals of 30 min. This distribution was recorded in the spray booth during 30 min prior to the start of the spray application (red dotted curve). b Relative change of the contribution of each channel to the total measured mass concentration with a time interval of 30 min. The relative contribution of the background to each channel is presented for reference (red bars)