Get one of those "Ionic Breeze" air filters from Sharper Image. They're pricey, but they really DO work in clearing crud out of the air. And over the long run, they're cheaper than other air filters because they use less electricity, you only have to wipe clean the collector plates, and are silent.
The same red chinese company that makes them for Sharper Image is now marketing an almost-identical generic version for about $150 at major big-box stores. I guess Sharper Image had an exclusive for a few years, and now there's competition.
The things work amazingly well. I got mine after a buddy recommended it. His summer alergies are vey bad. He said if he'd have known how well the thing worked, he would have bought one years ago.
Do you have any suggestions for a workplace that's just covered in dust, air conditioner sucking the water out of the air, and stuffy, too? I think that's my main problem.
I should check into that, too. I've been sneezing a lot the past few weeks when I have the windows open. I seem to be allergic to something outside but I don't know what.