How effective are air purifiers for allergies?

According to the Environmental Protection Agency (EPA) (opens in a new tab), HEPA filters can, in theory, remove up to 99 or 97% of dust, pollen and any particles in the air with a size of 0.3 microns, so they should safely care for pet dander that floats in the air. Using a HEPA filter in your home can remove most of the particles in the air that could worsen allergies. But airborne particles aren't the only ones in your home. There's much more to their rugs, bedding, and curtains, and they rest on countertops and tables.

That's why it's important to keep these areas clean. It is also important, whenever possible, to eliminate the source of allergens and irritants. For example, the only effective way to keep tobacco smoke out of your home is to not smoke. PhoneSoap states that this air filter can also reduce allergens, such as pet dander, and help purify polluted, smoke-filled air more than traditional filters, which can accumulate contaminants if not changed frequently enough.

For the best overall results, select an air purifier that uses an activated carbon filter in combination with other filters, such as a HEPA filter. If you have a central air conditioning system, consult an accredited contractor about replacing the manufacturer's filter with an approved furnace filter (the right size for your unit and the size of your air ducts) with a minimum efficiency rating (MERV) of 11 or 12, and then configure the fan so that it works continuously. The type of air filter you use is also important, as some work by capturing and filtering larger allergen particles, such as dust, while others, such as UV purifiers, work better at killing mold and bacteria. But make sure your air purifier also has a HEPA filter to remove particles, since the carbon filter alone doesn't trap dust or pollen.

While a HEPA filter will trap ash from the air, to eliminate the smell of smoke, look for an air purifier that contains an activated carbon filter. In fact, the Environmental Protection Agency (EPA) warns that the functionality of air purifiers is limited in terms of filtering gases and that filters must be replaced frequently to work optimally, usually approximately every three months. A professional HVAC company must install a HEPA filter for the whole house and be properly sized for its air treatment unit, in order to protect the life of the equipment and ensure that air passes through the HEPA filter and not around it.