What type of air purifier is best?

My son has allergies and is having trouble sleeping at night. I\'ve been looking at different types of air purifiers but I\'m not sure what we need. I\'ve read that air purifiers with ozone are dangerous. Is there anything else I should be looking out for?
-Liz S., Seattle, WA

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Hi Liz,

Air purifiers come in many shapes, sizes, coverage areas and technologies. The decision can be daunting. You first need to determine what you are wanting to purify. Certain technologies work best for allergies, others work best for bacteria, particulates, odors and other pollutant types. HEPA purifiers usually do a good job taking care of various particulate pollutants such as those that cause seasonal allergies. Also, you need to consider whether you want the air purifier to cover your entire house or just a single room, such as your son's bedroom. Finally, try to find a purifier that is Energy Star certified. Energy use of air purifiers can vary widely and the Energy Star approval can help ensure your choice doesn't cost your a fortune on your electric bill. As far as ozone goes, I'd personally avoid purifiers that have this.

-Cameron W., Denver, CO

Liz, There are two basic types of air purification, passive and active. Both types are available in portable (individual rooms) or whole house systems. The passive systems are typically filtration, in other words the air you want to clean needs to get to the filter. They clean and disinfect only the air that gets to them. The active products distribute some type of molecules into your air. These molecules depending on the product attack microbial pollutants, odors and gases. I also recommend better filtration with a Merv 10 or better filter either in your furnace or portable filter.
-Jeff Olinghouse, Van Wert, OH