A quality air purifier will cost you at least $300-400. But they're worth it. With all the shit circulating the air, yuck. My condo just installed something that relieves smoke from the vent room and it smells like shit and it's right outside MY WINDOW. Targeting. Ew.
Anyway, check for one that has laser scanning of particles in air and has a quality HEPA filter that has been reviewed well. Some of these can be washed, but mostly look for one that has a year warrenty and then at the end change it out for free.