During the California fire season, I learned to rely on the PurpleAir app to warn me about dangerous smoke particles and my two air purifiers to protect my health at home. But I was wondering how well my air purifiers are working and if I need another one or two. And was my duct system clean so every time the heater was turned on, particles were thrown into the air. As such, I was pleased to find that TemTop's readings differ slightly from PurpleAir's, but both correlate strongly with official, more accurate government readings (which are 24 hours lagged and virtually useless for real-time protection). I walked my TemTop down the street where a neighbor has an external PurpleAir monitor and the reading was within a few (2-5 difference) of a PMI of 2.5. Indoors I was even glad my air purifiers worked well enough (in 20 minutes a PMI dropped from 2.5 from 20-25 to 2) so I didn't have to buy another one.
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