Not the OP, but I have bought a Sensirion particulates sensor which I have used to measure the number of particles coming out of two air purifiers. It showed al

Not the OP, but I have bought a Sensirion particulates sensor which I have used to measure the number of particles coming out of two air purifiers. It showed all 0 in the case of one purifier and very low values compared to ambient in the case of the other. Here's what it shows in my bedroom: measured values: 0.88 pm1.0 0.93 pm2.5 0.93 pm4.0 0.93 pm10.0 5.87 nc0.5 6.95 nc1.0 7.00 nc2.5 7.00 nc4.5 7.00 nc10.0 0.52 typical particle size