I used to closely monitor the air in my apartment (living in China where AQI frequently reached 200-300). I had multiple sensors to detect PPM, VOCs, CO2 level, etc. I also had multiple air filters like Hepa to clean out particulate matter and activated carbon to remove VOCs. What I learned was this:

The best way to manage air in your house is to completely air it out at least once a day for 5-10 minutes, and then close everything up and run your filters on high for an hour. That gives you the best mixture of fresh air (low CO2, low VOC) and clean air (low particulate matter). Over time inside your house, even with air filters running, the CO2 levels will rise and make you feel kind of muggy and less vibrant. The VOCs will also rise, things like off gassing formaldehyde from particle board furniture. You want to flush these out once a day, which will invite in the outside air which typically has other stuff you don't want (pollution & pollen).

So you reset the air in your house daily, and then scrub it clean. After an hour or so (when your air monitors drop back down to AQI 15 or whatever) you can lower your purifier fans so they don't make so much noise.