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If the air in your home or workplace is starting to become a bit stale, a desktop air purifier is a great way to freshen the air without taking up too much space. The best desktop air purifiers use high-efficiency particulate air (HEPA) filters, have multiple speed settings, and are small enough to fit your work space.

Air purifiers that use HEPA filters are the best because HEPA filters can capture small particles and have been tested by the non-profit Institute of Environmental Science and Technology (IEST). But before you buy an air purifier, it is important to understand what the HEPA filter can and cannot do. They can filter out dust, pollen, mold and some other allergens, as well as particles in cigarette and wildfire smoke. However, they cannot remove all smoke particles because some volatile organic compounds are too small. Viruses and bacteria can also be filtered out to a certain extent. HEPA filters are not good at filtering odors, so if you are concerned about it, look for an air purifier that also includes an activated carbon filter.

Although the HEPA filter has passed the IEST test, you may also want to choose an air purifier that has passed the test by the Association of Household Appliance Manufacturers (AHAM), as recommended by NBC. AHAM and other third parties test the Clean Air Delivery Rate (CADR) of air purifiers, which evaluates the degree to which dust, tobacco smoke and pollen are removed from the air. The higher the rating, the better the air quality, 450 is the highest score for pollen and smoke, and 400 is dust.

To ensure that your air purifier operates efficiently, you also need to check its room size function. Most air purifiers specify the amount of space they can effectively handle, and if your room is too large, they may not be as effective. Other features to look for are filter replacement reminders and multiple speed settings. A higher speed setting will clean the air faster, but it will also produce more noise, so setting a lower speed can be helpful when you need to be quiet.

If you are ready for a new look, check out this list of the best desktop air purifiers-they start at just $48.

This small air purifier uses a HEPA filter with a CADR of 56 for dust, a CADR of 50 for tobacco smoke, and a CADR of 76 for pollen. It measures only 7.5 x 6.5 x 11 inches and weighs 5.2 pounds, so it can be placed on your desk and easily moved from room to room. It includes a UV-C lamp that helps in overall disinfection, and a charcoal filter that helps reduce odors. This air purifier has three speeds, including a quiet sleep mode and a filter change dial on the back. (The replacement filter package can be purchased online). This air purifier is a popular choice on Amazon, with more than 2,900 perfect five-star ratings.

One fan praised: “This air purifier is easy to use, I don’t even need an instruction manual. However, despite its simplicity, it has significantly improved the air quality in my room [...] In terms of price , This small machine is really useful. It is almost silent at the lowest setting, even at the fastest speed, it will not cause damage. As for remembering when to change the filter, there is a small dial on the back, You can set it 6 months in advance, and then, hope to remember to check the back of the air purifier after 6 months. I am very satisfied with this purchase. If you are looking for a low-cost high-quality small indoor air purifier, I strongly recommend you Buy."

This desktop air purifier is manufactured by Honeywell and has also been tested by AHAM. The CADR for dust is 63, the CADR for tobacco smoke is 50, and the CADR for pollen is 53. It measures 12.05 x 8.46 x 11.18 inches and weighs 4.8 pounds, but even if it is small, it can still filter the air in an 80 square foot room up to five times per hour. It has three cleaning settings and an indicator light to notify you when the filter needs to be replaced. The purifier also has an activated carbon pre-filter specially used to treat peculiar smells. Like Germ Guardian air purifiers, Amazon provides filter replacement services.

A fan praised: “When I put it in my office, the HEPA filter turned dark gray in just 60 days...it was really dark gray. The air in my office is terrible. I have Honeywell air purifier, my HEPA is not dirty after a year. Finally, I managed to persuade the building maintenance staff to install better filters in the air handling system leading to my office. When there is a lot of dust, they Reluctantly installed the filters they used during construction. Now HEPA lasts longer...say 6 months. If you work in a commercial office building, you really need one of them. Before you use this kind of air Before the purifier, you didn’t know how bad the air was. One advantage is that it is like a white noise machine. It is located next to my desk, close to my phone, and does not interfere with calls on the hands-free phone. When people When they entered the office, they would not notice this except to mention that the air in my office smelled fresh."

Also recommended by Wirecutter, this LEVOIT air purifier is very suitable for larger spaces. Although it has not been tested by AHAM, it does use a HEPA filter. There is a convenient touch screen at the top to control the timer, display lights and speed settings, and a light to remind you when to replace the new filter. It weighs 8.73 pounds and measures 8.7 x 8.7 x 16.25 inches, which is larger than the other options on this list, but it also has an area of ​​up to 219 square feet. This air purifier has received more than 16,000 five-star reviews on Amazon (HEPA filters can be purchased to replace HEPA filters). In addition to the standard Core-300-RF filter, it also has a Core 300-RF-PA filter for pet allergens and a Core 300-RF-TX filter for smoke, smoke and other toxins .

A fan praised: "One of the best TRUE HEPA filter air purifiers on the market. Starting from the appearance/design of the unit... it is simple, clean lines, and shorter than most of the similar products. From The reviews from the reputable "review site" are ranked in the top 3, if not #1. Now it works...fan noise, in the "sleep setting" is almost inaudible! It's crazy...I like the fan will not Jump from setting to another setting, but when changed, it effortlessly moves the setting between the two settings smoothly (unlike anything in the market I have experienced). If you are working for a small to medium room Looking for an air purifier, this is one of the most highly rated on review sites...This is your only choice, because in all respects, its bet is equal to any other product on the market today."

This small air purifier is not rated by AHAM, but it does use HEPA filters and filters with activated carbon filters to remove odors. In order to really solve the peculiar smell, this air purifier also has an essential oil sponge, in which you can drip your favorite essential oils. It measures 7.5 x 7.5 x 13.8 inches and weighs only 3.19 pounds, making it the lightest option on this list. It has adjustable speed and lighting settings, as well as a control panel lock function. When you run the filter, a replacement filter is available on Amazon.

A fan praised: "I bought this for a room of about 90 square feet. When I can't keep the windows open, it can remove smoke/steam from the air. This small filter easily meets my needs, and Set at the lowest setting. It’s compact and can be conveniently placed on a shelf on my desk. At the lowest setting, it generates as much noise as a computer fan, so it’s also very quiet and unremarkable.”