I have an ambient air filter I run pretty much continuously during work, and then with the timer at end of day to clear the air. It's the unit described by Bill Pentz on his web-site. I don't have any meters that indicate metrics on how well it performs, but I can see and feel a difference. The cost is essentially the cost of the filter plus the cost of the in-line fan.
This is in addition to the centralized dust collection system.