I own an IQAir AirVisual Pro, it has identified when the air from ovens affect air quality. And, I bought a Honeywell HPA300 True HEPA Air Purifier and you can see air quality improve significantly when it is on. Also, when a large group of guests come over the CO2 monitor accurately tracks the large increase. And, it detected when Elon's factories had their fires. In addition, anytime there were forest fires in California it detected the increased pollution from those as well. The air quality several states away is affected by those fires severely btw, pretty interesting. The smoke plumes travel all the way to Maine. I've been pretty happy with both products. When the air quality drops outside, I close the doors and windows and let the air purifier do its magic. I leave the HPA300 on "Germ" mode, it is pretty quiet and still gets the job done.