Your concern is well founded.
A few months ago I went and bought some Metro’s along with some of the appropriate sensors from Adafruit because I was curious about both particulate and VOC’s.
Turns out that during printing, both were getting detected. I feel good about the data but in regards to particulate, I am not sure if I was truly generating NEW particulate or the various fans were just churning a fixed amount of particulate inside a closed vessel.
I have never heard anyone say they had to vacuum out their P1S or X1C because it was full of dust.
These two threads might be worth scrolling through although they are rambling at times.
P1S Print Start Visualized
DIY Fume extraction for P1S questions…