Figure 2: Schematic of PM sensor measurement setup: 1—PVC enclosure, 2—air inlets with mesh filters, 3—air outlet with fan, 4—Raspberry Pi microcomputer, 5—power suppliers, 6—temperature and humidity datalogger, 7—OPC-N2 sensors (Alphasense), 8—ZH03A sensors (Winsen), 9—PMS7003 sensors (Plantower), 10—SDS011 sensors (Nova Fitness), and 11—USB hubs. Figure 2 is reproduced from Badura et al. [38] (under the Creative Commons Attribution License/public domain).