Figure 3: Results of PM2.5 measuring campaign: (a) TEOM 1400a analyser, (b) SDS011 (Nova Fitness), (c) ZH03A (Winsen), (d) PMS7003 (Plantower), (e) PMS7003 “AE” (Plantower), and (f) OPC-N2 (Alphasense). 1-hour averaged data for selected sensors was plotted for clarity. Please note the different scales on the -axes.