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Something like this: https://www.amazon.com/dp/B078ZS8RVL
Does formaldehyde , pm2.5 and VOC. When you get it, you need to be outside away from any motor vehicles/roadways before you turn it on. The unit immediately goes into a quick calibration mode upon first startup. If you turn it on inside the house first, you will need to go outside and rerun the calibration which takes 5 minutes.
Mine just got here yesterday and all I’ve had time to do is turn it on. I’ll know more about how well it works tomorrow when I have time to setup a print.
This is what I use...I am away from Home now..
Does this give you any clue?
Air Quality Pollution Monitor, Formaldehyde Detector, Temperature & Humidity Meter, Sensor, Tester; Detect PM2.5/PM10/PM1.0 Micron Dust, Test Indoor TVOC Volatile Organic Compound Gas; eBook https://www.amazon.com/dp/B078ZS8RVL/ref=cm_sw_r_apan_glt_fabc_8CBN508V5CN99GRSK4QK
You speak the truth, my man.
Don't know if this will make you comfortable or not, but you can get portable and stand alone air quality detectors that can measure down to PM 2.5 (really, really tiny floating stuff in the air). I use the Eve Room that is connected to my home network, but there are dozens of others to choose from.
My air quality is always between excellent and good, unless we are cooking big meals. Then the VOC counts goes through the roof for a few hours.
Lets say you monitor your air and you want it better. Consider a room or even whole house air purifiers. They do an excellent job of removing the little floaties that are causing your concern. Quiet, efficient, and will not blow your power bill all to hell.
One approach to this might be to start tracking your air quality over time in the Model 3. There was a recent story about a Model S being in the fire area, where the driver had a clever little device for measuring air pollution elements such as parts per million of 2.5 micron or larger particles. Like the readings you can get from airnow.com. His meter registered massive air pollution outside the car, but remarkably low counts inside the car with defense model set to Def Con 1.
I just made up the def con part. But the meter was so interesting that I bought a similar one off Amazon and just took delivery today (https://www.amazon.com/gp/product/B078ZS8RVL/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1).
You'll never get readings from the 3 like you will from an S, but you could compare how good the 3 is over other cars, and also possibly establish a baseline to know when the filter in the 3 needs changing.
Air Quality Pollution Monitor https://www.amazon.com/dp/B078ZS8RVL
this was just from research, at this point I'd look for a VOC sensor to get real data. I have this in my cart to get at some point, but there are a ton of knockoffs on amazon... https://www.amazon.com/gp/product/B078ZS8RVL