Marketing a vac as a "pollution control system" is stretching the point of what a vac does.
 
Wrt indoor pollution, all a vac seems able to do is remove accumulated dust from floors and whatever that can otherwise be kicked up by foot traffic, etc.  
 
If the vac filtration system's poor (CU and others list them every so often), those vacs make it worse by redistributing the dust to furniture, appliances, etc.
 
Dust's pretty hard to keep out.  In my apartment, complete with air purifier and high-end HVAC filter, dust accumulates anyway.  So every so often it's get out the electrostatic "fur wands" and compressed air to get rid of dust the vacs and air purifiers miss.

O.T. your perfectly right but people just will try one way or another to make a sale.
 
It still remains that a large part of household dust is generated by occupants of the home.  We each slough of dead skin particles, hair, etc., daily and when you've got three, four or more humans  in the average home that process is all the more obvious.  Thus the vacuum we use to solve the problem of dusty air is merely working inside the environment generating the problem.  Clean air quality is probably much better aided by good mechanized ventilation systems that allow clean fresh air in and either exhaust or capture airborne material in the home environment.
 
Vacuums definitely are not designed to promote air movement or cleansing throughout an entire household.  It should suffice as more than enough that your vacuum effectively lifts and captures particulate material from the surfaces you apply it to.
 
Filter Queen (which I love as a vacuum) and Rainbow for years have encouraged users to sit the machine somewhere in a room and just let it run.  I've tried this but didn't see much difference for the effort other than the pleaseant air scent form the use of whatever "deodorizing" agent the maker recommended.  The so-called air purifier will do the same with less noise and power consumption room to room
 
Venson