The Best Air Purifier for Allergies: HEPA Filters and Beyond

When it comes to allergies, the Environmental Protection Agency (EPA) recommends using HEPA filters to remove up to 99.97% of dust, pollen, and any airborne particulate matter with a size of 0.3 microns. This means that they could help eliminate pet dander that is found in the air. After testing more than 50 air purifiers over the past nine years, our measurements have shown that the exceptional Coway Airmega AP-1512HH Mighty is the best of them all: powerful enough for a large room, quiet enough to sleep nearby, designed to last for years, and affordable enough to be installed in several rooms. HEPA air purifiers, such as those from Coway and Airmega, are great for filtering wildfire smoke from your home air.

We tested this method on the Airmega AP-1512HH Mighty and the Airmega 400 from Coway for three hours (one hour at high temperature), followed by two at medium temperature after burning 15 wooden matches to create a large initial load of fine smoke particles. The Honeywell InSight HPA5300B, a model for large spaces, is likely to work well, but after measuring its electricity demand, we ruled it out. Compared to the Blueair Blue Pure 211+ that we chose for large spaces, the Honeywell consumes 33, 60, 94 and 117 watts at its four speeds (from low to turbo), respectively. The Blue Pure 211+ reaches a maximum of 64 watts and is slightly more powerful in terms of clean air supply rate (CADR).The Blueair 411 removes up to 99.97% of airborne particles and up to 99.99% of pollen, making it an excellent choice for people with seasonal allergies.

Then, we looked for the most popular air purifiers on the market and analyzed each of them to determine elements such as filtration capacity, noise, and value. Some air filters are designed to trap microscopic particles that can cause an allergy attack or worsen allergy symptoms. For example, researchers have found that HEPA air purifiers are effective against allergies to house dust mites and can reduce particulate matter to improve allergy symptoms. The Coway Airmega 240 has no unique abilities; rather, the special case is that you are looking for an air purifier that looks fantastic, performs well and is affordable. That's why we looked for air purifiers with HEPA filters that used activated charcoal or similar purifying ingredients to help filter allergens such as pet hair and dander, pollen, and smoke.

This Honeywell air purifier is designed for medium-sized rooms (155 square feet), but there are models that cover large rooms (310 square feet) and extra large rooms (465 square feet). They can look for a device with a clean air supply rate (CADR) and an efficacy rating from the Home Appliance Manufacturers Association (AHAM).This air purifier uses an authentic HEPA filter to capture small particles such as pollen, pet dander, dust, and mold spores. An air purifier won't get rid of allergies, but it can help reduce symptoms inside the house. While it can be nice to snuggle up with pets or open a window to let in some fresh air, it can also cause lots of dust, dander, or air impurities to come in.

Researchers have found that using an air purifier to treat allergies can be effective, although these devices may not always lead to significant improvements. When it comes to choosing an air purifier for allergies, HEPA filters are your best bet. They are designed specifically to capture small particles like pollen and pet dander that can cause allergy attacks or worsen symptoms. However, there are other features you should look out for when selecting an air purifier. Look for models with activated charcoal or similar ingredients that can help filter out allergens like pet hair and dander, pollen, and smoke.

Additionally, make sure you choose a model with a Clean Air Supply Rate (CADR) rating from the Home Appliance Manufacturers Association (AHAM) as well as an efficacy rating. Finally, consider how much space you need your air purifier to cover. If you have a larger room or multiple rooms in your home that need coverage then you may want to look into models designed for larger spaces like the Honeywell InSight HPA5300B or the Blueair Blue Pure 211+. On the other hand if you only need coverage for one room then you may want to opt for something like the Coway Airmega 240 which is designed specifically for medium-sized rooms.