One time, I told my husband we need to buy an air purifier since sometimes our condo smells like mildew especially when we use our heater or air conditioner. I do have an allergy since when I smell something odorous I sneeze or I get easily sneeze if I smell any strong odor which is annoying. I found this aircleanersguide.com which has air cleaners guide or a site which has information of different kinds of products designed to remove allergens and pollutants from the air and to find out more, you can check the site.