I'm asking myself if building a DIY setup or buying something like Airthings Wave Plus will actually track these compounds at decent accuracy - and if anyone here has gone down this rabbit hole for family health?

From what I've gathered, consumer devices hit acceptable accuracy for CO2/temp/humidity but PM2.5 is hit-or-miss, and VOC readings are more "relative change indicators" than absolute values..

DIY with Home Assistant is more work/fun yes but again only gets similar accuracy AFAIK (with potentially better automation)..