You don't bother me at all. Regarding the dust and floating particles, it's an enemy you can't defeat but with filters, which are frequently used within desktops, but for laptops it's not really worth it unless the manufacturer includes them by default, vent holes are really small and it requires a lot of effort for a final result that really matters.
My only recommendation for this is try to be careful and avoid dusty environments as much as possible, also if you have a mini air-blower can be helpful sometimes for vent-holes if you see some dust pile accumulating there, be really careful with those though, dust and fast-moving air can drive to static charge, so nothing really powerful and avoiding direct airflow to the vent.
Despite that, dust will accumulate inside your computer, no matter what, and the only solution for laptops as for any other computer, is to open and clean it (there are diff methods to accomplish this) ... specially the fan blades, which will be the most crowded dust space. In the case of an Apple laptop computer, I'd be extra-careful if I had to perfom this inside cleaning operation, but also, to make you remain calm, if your work environments are mostly "clean", you won't need this till the 3th or 4th year of operation
PS: Macbooks are the computers which I found less dusty than any other laptop I opened.