Comment by alsetmusic

I've been using Netatmo stations in each room plus one outside for a decade. They monitor temp, CO2, and humidity. My CO2 levels were nightmarish during wildfires in my part of California across multiple years. Of course, the air tasted horrible and it was absolutely evident how bad it was just breathing two different years so it was not at all surprising to see that correlated on instruments that I check multiple times every day.

Edit: missed a letter