The Blueair Blue Signature Small is a compact air purifier built for bedrooms, home offices, and other small to medium-sized rooms. It uses Blueair's HEPASilent filtration system along with a washable fabric pre-filter. It also connects to a smartphone app and includes an onboard air quality sensor that can automatically adjust the fan speed as indoor air quality changes. One thing to note is that it uses an ionization system that can't be disabled.
Our Verdict
The Blueair Blue Signature Small is good for homes with pets. Its particle filtration performance is well-suited to keeping up with everyday pet dander and other fine airborne allergens in small to medium-sized rooms, like bedrooms or home offices. It also includes an odor-reducing filter to help manage everyday pet smells, though as with most compact purifiers, the limited volume of activated carbon means it likely won't fully eliminate stronger odors, such as those from litter boxes or a wet dog. Noise levels are also low enough to run continuously without startling skittish pets. One consideration for pet owners: like other Blueair models, it uses an ionization system that can't be disabled. Blueair states that ozone output stays within safe limits, but some pets may be more sensitive to ozone exposure than humans, so this is worth keeping in mind.
Exceptionally quiet operation, even at higher fan speeds.
Strong filtration for its size.
Ionization system can't be disabled.
The Blueair Blue Signature Small is a great fit for bedrooms. It's quiet enough that you'll mostly just hear a soft fan hum, especially at lower speeds, and Night mode shuts off all the display lighting for a darker room. The built-in air quality sensor and Auto mode handle fan speed adjustments on their own, so there's no need to fuss with settings throughout the night. It's also compact and nicely designed, with a clean, understated look that fits in well on a nightstand or dresser without standing out or taking up much space.
Exceptionally quiet operation, even at higher fan speeds.
Compact design fits easily on the floor beside a bed or desk.
Auto mode and smartphone app provide a convenient hands-off experience.
Strong filtration for its size.
Ionization system can't be disabled.
The Blueair Blue Signature Small's particle filtration rate is decent. Its maximum clean air delivery rate suits bedrooms, home offices, and other small to medium-sized rooms, and even at its quieter fan speeds, it moves enough air to keep things in good shape in smaller spaces. For larger, open-concept areas, though, you'll likely want something with a higher CADR.
Strong filtration for its size.
Limited clean air delivery for large spaces.
The Blueair Blue Signature Small has a compact footprint, staying true to its name. It is easy enough to fit into smaller rooms without dominating the space. Its modest size makes it simple to place beside a bed, desk, or nightstand, while still delivering enough airflow to cover a typical bedroom or home office.
Compact design fits easily on the floor beside a bed or desk.
Strong filtration for its size.
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Differences Between Sizes And Variants
The Blueair Blue Signature Small is available in two main colors: Nordic Fog (light grey) and Midnight (dark blue), with a specialty New York Knicks-branded colorway (blue and orange with logo) also available. We bought and tested a unit in the Nordic Fog finish, though we fully expect the Midnight version to perform identically. For those interested, here's the product label for our test unit.
If you come across another variant of this air purifier, let us know in the comments below so that we can update our review.
Popular Air Purifier Comparisons
The Blueair Blue Signature Small is one of the smaller air purifiers in Blueair's lineup and is intended for small to medium-sized spaces. It delivers substantially stronger particle filtration than the similarly sized Levoit Core 200S, along with quieter maximum fan noise and the added convenience of an onboard air quality sensor with automatic fan adjustment. It also offers much stronger air-cleaning performance than the Shark BreatheClear Compact Pro HP062 while occupying a similarly compact footprint. That said, if you're trying to cover a larger bedroom or living room, the Winix C610, which is still relatively compact, is worth considering. Like the Blueair, it uses an ionization system, but unlike the Blueair, it can be turned off if preferred. If you like the Blue Signature Small's design but need more room coverage, consider stepping up to the Blueair Blue Signature Large.
If you're interested in alternatives, see our recommendations for the best air purifiers for bedrooms, the best air purifiers, and the best air purifiers for pets.
The Blueair Blue Signature Large is the better choice if you need to clean the air in larger spaces, while the Blueair Blue Signature Small is better suited to smaller rooms. Both share the same overall feature set and user experience as the Blue Signature Small, including app connectivity, an air quality sensor with automatic fan adjustment, and Night mode, and the two also share the same fabric exterior and overall aesthetic. The Large's higher clean air delivery rate makes it a much better fit for larger bedrooms, living rooms, and open-concept spaces, and its flat top even lets it double as a small table. The Small still has its place, though, fitting more easily into tighter areas and making more sense if you're only looking to clean the air in a smaller room.
The Blueair Blue Signature Small and the Winix C610 are really built for different jobs. The Blueair makes more sense for smaller bedrooms, dorm rooms, or home offices, where its quiet operation, small footprint, and strong per-size performance stand out. The Winix, on the other hand, pushes substantially more airflow, making it the better pick for medium to large rooms, though it's worth noting that while still a compact air purifier, it has a noticeably larger footprint than the Blueair. It also has app connectivity and an air quality sensor of its own, though it gets considerably louder once you push it to the highest fan speed.
The Blueair Blue Signature Small outperforms the Levoit Core 200S overall. It offers substantially stronger particle filtration while staying quieter at its highest fan speed, and it adds an onboard air quality sensor with Auto mode, which lets it adjust fan speed automatically as conditions change, something the Levoit doesn't offer. That said, the Levoit is considerably more affordable, so it's worth considering if you're on a tighter budget or planning to spread a few purifiers across your home.
The Blueair Blue Signature Small simply outperforms the Shark BreatheClear Compact Pro HP062. Despite a similar footprint, it cleans the air far more effectively and stays noticeably quieter at its highest fan speed, making it a more comfortable option for everyday use. Both purifiers come with an air quality sensor that automatically adjusts fan speed, but only the Blueair pairs with a smartphone app, giving you remote control, scheduling, and filter monitoring that the Shark doesn't offer.
Test Results
The Blueair Blue Signature Small uses a four-stage filtration system made up of a washable fabric pre-filter, a combined particle and activated carbon filter, and an odor-fighting mineral layer. Blueair markets this as a seven-stage system, but several of those "stages" are really just technologies built into the filter rather than separate physical layers. Like many Blueair purifiers, it also relies in part on HEPASilent ionization to improve particle capture. That system produces a small amount of ozone, which is advertised to stay within safe limits, but it can't be turned off, so it's worth keeping in mind if you're particularly sensitive to ozone. The main filter is rated to last up to a year under normal use, and the washable fabric pre-filter just needs periodic vacuuming or cleaning to keep performance up. Replacements are available in a few different colors to match your decor.
