Just a couple of other things to consider.....
First off ,, ,where is your studio located and do you have a forced air heating/cooling system ? If you have a furnace or air conditioner with duct work in a crawl space or attic that conditions your studio you may want to start there. It doesnt matter what kind of filtration you have in the room if you have duct work that may pull in unwanted things from below or above the conditioned area. Attic insulation or a musty crawl space combined with a leaky duct system can be a dust nightmare. Not to mention other problems it may cause like mold and health issues.
You could seal every nook and cranny in the room , but if your heating/cooling system is not properly sealed it is just a waste of time and effort.
Air purifiers help a lot but require a lot of cleaning to work efficiently.