Measures radon to identify if your home should have a radon mitigation system.
https://www.cdc.gov/radon/about/index.html
This is the current historical data for my (Tim's) home. I installed a radon mitigation system 10/31/22 as I saw levels get as high as 18 pCi/L.
Airthings app provides clearly defined air quality metrics with color coding to indicate whether these numbers are good, ok, or bad
https://www.airthings.com/contaminants
