I have been tracking my airquality with a device called AirQ Pro / Science

What i like about this device that they give a very precisce and clear physical definition of each metric and explain by what quantitative factors the metric is influenced.

incl. potential measurement error sources and ability's to reset sensors.

Definitely recommend this over other air quality devices that try to simplify all the measurements into good/bad..

(Note: Just a happy user no affiliation whatsoever with the company)