@marcelharmon67
But in the absence of all other potentially relevant data, it's nonetheless an important tool for mere humans.
My snarky tone is NOT actually directed to poster; I'm still irritated by that #Atlantic piece.

SO get the #QPLite monitor: under $100 with #CO2, #PM25, #PM10, temp and humidity. Demonstrated to be comparable to #Aranet4, as my own observations affirm. Really a fan. Wish #libraries would loan these!!!
https://www.howsyourair.com/qp-air-quality-monitor-lite
#IAQ #HealthyAir