They do! Although they require a correction factor to better match the government's fancy air quality monitors when measuring smoke. The EPA published a paper o

They do! Although they require a correction factor to better match the government's fancy air quality monitors when measuring smoke. The EPA published a paper on it: https://github.com/shanet/ClearAir/blob/master/docs/PurpleAir%20PM2.5%20Correction%20and%20Performance%20During%20Smoke%20Events.pdf https://github.com/shanet/ClearAir/blob/master/docs/PurpleAi... While we're on the topic: Shamless plug for a PurpleAir clone I made last year that uses the same sensors but at half the cost (and keeps all of the data within your LAN): https://github.com/shanet/ClearAir https://github.com/shanet/ClearAir and https://www.digikey.com/en/products/detail/adafruit-industries-llc/4632/12715744 https://www.digikey.com/en/products/detail/adafruit-industri...