When I think of air filters, I picture large devices that are too big to use in an office cubicle – and they certainly won’t work in a car. The Air Naturalizer from CritterZone is only 4.5″H x 2.75″W x 2″D, so it’s small enough to place discreetly near your pet’s bed or litter box to contain odors. You can also use it in your office or cubicle at work, in a bedroom or kitchen at home, or anywhere you want to control odors and reduce germs. CritterZone says their Air Naturalizer “creates a natural, charged flow that fills the room or vehicle and continually cleans the air. The sun provides the outdoor air with the power and energy it needs to clean itself: a power and energy that indoor air lacks. CritterZone provides indoor air with the natural charge it needs to virtually eliminate odors, allergens, dust and bacteria.” It’s available as a wall unit that plugs directly into an outlet or with an AC adapter and cord for indoor use (either unit is $89.95) or with a 12V adapter for use in your car ($99.95).