I have an anecdote about the Awair. The air at one of my previous workplace was making me sick, so I asked the management to look at the air quality. They hired a professional who saw nothing - because they asked for the AC to be turned off during the monitoring.
I got an Awair and managed to track when the air quality dropped. It was whenever the AC came on. They then called another professional who finally caught it -- turns out the building's ventilation ducts had not been cleaned in 5 years AND there was water damage.
Without a customer grade air quality tracker, I would have simply believed the first professional. I would have had to either suffer being sick daily at work or having to quit for air quality reason.
Now I carry mine around to my friends and family's house and let them borrow it for a while. It always come up with explanations about issues people had been quietly enduring forever.
If you want to use one suche device on the go, at friends places, etc., I'd recommend the Atmotube Plus or Atmotube Pro by Atmotube (depending on your needs).
My purchase was a few years ago now. I've heard that the market is bigger now, so you may want to shop around. I also have the big Dyson purifier at home which comes with built-in sensors.
One of the main problems is that homes are not built for indoor air quality. Furnaces in crawl spaces or garages, lack of air sealing. You can't just add sensors and fans to fix the problem.
Plus, adding a fan/vent to a home isn't ever going to be cheap. You're talking about cutting the interior and exterior of your house, running ducting and wiring up electrical.