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How We Tested Each

For each air purifier we follow the same method. We begin by lighting a stick of incense and letting it burn for about 10-15 minutes, until our air quality monitor reading hits a steady threshold. For the tests of the small-room air purifiers, we did them in a 200 sq ft office and the AQM threshold was about 140 for each. The baseline air quality reading is typically 2 or 3. We then ran the air purifiers on comparatively similar levels and then took new AQM readings after 10 minutes, 30 minutes, 60 minutes, and finally 2 hours. We also measured the noise levels with a decibel reader, and the fan speed with an anemometer to help determine the CFM. Each of these metrics help us determine the overall performance of an air purifier.

Best Small Air Purifiers

Do Mini Air Purifiers Really Work?

The short answer is yes, mini air purifiers can be effective, but their efficiency is closely tied to their design, the technology they employ, and the specific needs they are meant to address. Mini air purifiers, especially those equipped with HEPA filters, are adept at capturing a wide array of airborne particles, including dust, pollen, smoke, and pet dander. These devices work by drawing air through filters that trap the pollutants, recirculating cleaner air back into the room. The effectiveness of a mini air purifier is also determined by its clean air delivery rate (CADR), which measures how well it can purify the air within a specific area size.

However, it’s important to set realistic expectations when it comes to the capabilities of mini air purifiers. Their compact size means they are best suited for small spaces up to 100 sq ft, such as personal offices, bedrooms, or dorm rooms. In these environments, mini air purifiers can significantly improve air quality, especially for individuals with allergies, asthma, or sensitivity to air pollutants. For larger spaces, though, their effectiveness diminishes, and multiple units or a larger air purifier might be necessary to achieve the desired air quality. Additionally, while mini air purifiers can reduce the presence of airborne particles, they are less effective against gases and odors unless they include activated carbon filters or other technologies designed to tackle such pollutants.

Mini air purifiers do work, offering a practical solution for enhancing air quality in smaller spaces. By incorporating advanced filtration technologies, these diminutive devices can play a significant role in capturing a variety of airborne pollutants, contributing to a healthier indoor environment. When selecting a mini air purifier, consider the specific pollutants you need to address, the size of the space, and the purifier’s CADR rating to ensure it meets your air quality improvement goals. Remember, a mini air purifier is part of a broader strategy for maintaining clean indoor air, which should also include regular cleaning and adequate ventilation.

What is Considered a Small Room?

When we say small room, we mean your bedroom, home office, bathroom, nursery, and similarly-sized rooms (rooms around 100 sq. ft. or less).

You will find that many air purifiers priced in the budget-friendly range are most effective in smaller rooms and will likely not clean the air as well in a larger space. All of our recommended air purifiers should have enough power to generate two times an hour (our minimum) air exchanges at the highest speed setting in small rooms.

Do Air Purifiers Get Rid of Smells?

The ability of air purifiers to get rid of smells largely depends on the type of filter technology they use. Two common types of filters that are especially effective in odor elimination are activated carbon filters and ionizers, each working through a different mechanism to tackle unpleasant smells.

Activated carbon filters are particularly adept at removing odors and gases from the air. The porous nature of activated carbon allows it to absorb volatile organic compounds (VOCs), cooking smells, pet odors, smoke, and other gaseous pollutants, effectively neutralizing them. This makes air purifiers equipped with activated carbon filters a popular choice for maintaining a fresh-smelling indoor environment. However, it’s important to note that the effectiveness of carbon filters can diminish over time, requiring regular replacement to maintain their odor-eliminating capabilities.

Ionizers, on the other hand, work by emitting charged particles into the air that attach to airborne pollutants, including odor-causing molecules, causing them to settle out of the air. While ionizers can be effective in reducing certain types of odors, they come with notable risks. One of the primary concerns with ionizers is their potential to produce ozone, a harmful lung irritant that can exacerbate asthma and other respiratory conditions. The Environmental Protection Agency (EPA) cautions against the use of air purifiers that generate ozone, highlighting the importance of choosing ionizers that are specifically designed to emit minimal or no ozone. Consumers should look for air purifiers with ionizers that meet safety standards and are certified by reputable organizations to ensure they do not pose a health risk.

Air purifiers can be effective in getting rid of smells, particularly when equipped with activated carbon filters or safe ionizing technology. While activated carbon filters excel in absorbing and neutralizing a wide range of odors, ionizers can assist in removing odors by causing pollutants to settle from the air. However, it’s crucial to be aware of the potential risks associated with ionizers and opt for models that minimize ozone production.

What to Keep in Mind

When shopping for a small room air purifier, keep in mind that the fan is also smaller and will require higher operating speeds. Air filters that are True HEPA H12 or H13 and quality seals on the air purifier make it so that these models clean the air effectively at high/turbo speed, making it slightly noisy.

Running a small room air purifier at an operating speed of level 2 is typically a comfortable sound level for most people. When running at moderate speed, air purifiers can create non-intrusive white noise that masks outside noise, making them soothing in spaces like a bedroom or nursery. While running air purifiers at lower speeds usually reduces the noise, it is good to run them at high speeds throughout the day to create enough air exchange to make it beneficial.

When selecting a small room air purifier, consider that air filters will need to be replaced more frequently (around four times per year). Many smaller units have filters that combine HEPA and carbon, but not enough carbon to make a difference (recommended 1 pound of carbon) and often the modest amounts of carbon in the filter get depleted long before the HEPA runs out. Because of this, it is wise to avoid unknown or less established air purifier brands as you want to ensure replacing filters won’t be an issue down the road.

The Bottom Line

When shopping for an air purifier, remember to keep in mind the size of your room and the concerns you are wanting to remedy. The five air purifiers we have recommended are our top picks in this price range for rooms the size of a bedroom or home office. If you are looking for recommendations outside of this site, we encourage you to read reviews and choose brands that are known for their quality, customer service, and value.