I have the Awair 2nd Edition. It is similar to the Awair Element. However, as I don't have a smart home I sometime wish I had an Awair Glow C instead (disclaimer, it does not have as many sensors). It's a smart plug, so it can turn off the device you plug into it... I would plug my air purifier or maybe my air humidifier to it.

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.