whats the best kind of air purifier to get? for dust and pollen?

will a negetive ion get rid of dust, smoke, pollen, pet hair, and odors?

oreck professional cheaper at heartland america if you don’t mind slight cosmetic flaws http://www.heartlandamerica.com/ compact version is almost as good and on sale now 99$ 200 less than from orek

Oreck XL Professional Air Cleaner