Indoor air quality monitoring & health

I recently started getting worried about indoor air quality too. My brother smokes when he comes over and I can notice the significant difference of the air quality after he leaves. I literally JUST bought this monitor off of Indiegogo. It’s called iBaby Air : https://www.indiegogo.com/projects/ibaby-air-smart-air-quality-monitor-ion-purifier#/

I’m hoping they ship it fast, it was only $79 so I thought why not? I bought this other little device called Atmo Tube, it’s pretty cool and small but it doesn’t offer air purifying, this iBaby Air has air purifying.

Any other suggestions for now? What can I do to improve the air quality for now? I sometimes wake up coughing a lot, then the cough goes away once I leave to work.