Related: finding air quality measurement devices seems very difficult. It would be nice to know all the things in the air which we are concerned about - CO, CO2, Radon, PPM-stuff, etc. It seems few devices do it all, and some of them actually fake it (using a lookup table based on other measurements).
I'm hoping one of these days someone on HN who is an authority will post a buyer's guide.
I'm hoping one of these days someone on HN who is an authority will post a buyer's guide.