I’m a user of the N100 but I added a 60mm fan on it. I have a board that has full fan control so I have it so the fan is mostly stopped. It only runs a little at near 100% load. For me it was getting a little too hot. Noctua fans are really quiet. I never hear that PC.
What if I tell you that noise pollution is a type of pollution? A lot of car noise is tyre noise which is proportional to speed. Also, tyre and brake particules are a type of pollution. They are created mostly from accelerating and braking.