I built one as well, and with a whole bunch of other sensors (CO, CO2, alcohol/VOC, O3, PM2.5, PM10, humidity, magnetic field, IMU to detect earthquakes, and ev

I built one as well, and with a whole bunch of other sensors (CO, CO2, alcohol/VOC, O3, PM2.5, PM10, humidity, magnetic field, IMU to detect earthquakes, and even a Geiger counter). https://dheera.net/projects/airmonitor/ https://dheera.net/projects/airmonitor/ Only problem is I found the PMSA003I always reports PM2.5 = 0 when actual values are anywhere below 100ish. It only begins to detect after that.