When it comes to air purifiers, there are a lot of options out there. But which one is the most reliable? To answer this question, we've tested a variety of air purifiers to determine which one is the best. The BlueAir Blue Pure 211+ Auto is our top pick for the most reliable air purifier. In Auto mode (similar to medium; the air does not contain a particle counter to adjust to air conditions, but instead asks you to enter the approximate size of your room, after which the machine chooses a fan speed that Molekule deems appropriate), the air performed worse, reducing particles by 0.3 microns at only 18.0% (ambient) and 26.4% (clean).
In Silent mode, it performed even worse, reducing 0.3 micron particles by 6.5% (ambient) and 7.2% (clean). And in Dark plus Auto, with its primary PECO purification system turned off and its fan at the equivalent of a medium setting, it reduced them by 21.3% (ambient) and 18.0% (clean). The Levoit 400S performed better at removing airborne particulates in our home tests, capturing at least 99.5% and up to 100% of particles during testing. It also has an intuitive and easy-to-use intelligent interface, making it our best selection of air purifiers.
It's suitable for small room spaces up to 361 square feet, making it ideal for smaller spaces and bedrooms. Unfortunately, despite its great functionality, the VEsync application was not always reliable during our testing. The Coway-AP-1512HH air cleaner also benefits from a built-in particle sensor. This means you can get an idea of the air quality in your home with the color coding system on top of the device. It will show a blue light when the air is clean, purple to indicate pollution and red for high pollution.
Another smart feature of the Coway AP-1512HH are sensors that can adjust fan speed to keep the air clean, so you don't have to alter settings. We especially liked the Eco Mode of the Coway AP-512HH, which worked well to turn off the air purifier when air pollution was low, saving energy and money. The Dyson Purifier Cool is one of the most elegant air purifiers on the market. Its unusual design makes it a talking point in any room, while simple but cool extras like a magnetic remote control take it one step ahead of an average air purifier. At a level 6 setting, we found that the purifier removed 98% of particles smaller than 0.3 microns, 72% of particles smaller than 2.5 microns, and 73% of particles smaller than 10 microns.
At a level 10 setting, we found that the purifier captured 95% of particles smaller than 0.3 microns, 96% of particles smaller than 2.5 microns, and nearly 100% of particles smaller than 10 microns. The Blue Pure 221 was consistently better than all the other air purifiers we tested despite its lack of Smart technology. In a Level 2 setting, we found that the purifier absorbed 99.7% of particles smaller than 0.3 microns, 99.5% of particles smaller than 2.5 microns, and 100% of particles smaller than 10 microns. In a Level 3 setting, we found that the purifier absorbed 99.9% of particles smaller than 0.3 microns, 99.6% of particles smaller than 2.5 microns, and 100% of particles smaller than 10 microns. The Levoit H132 is small enough for any desk or shelf and its low price make it an ideal beginner's indoor air purifier that works well in small to medium sized rooms. Unfortunately, our home tests found that it did not live up to expectations when it came to testing how well it absorbed particles. Finally, the KOIOS EPI810 is lightweight and compact enough to take on the road and our at-home incense smoke test evaluated how well it worked after burning five incense cones simultaneously and found mixed results.
While it absorbed an impressive 99% of particles measuring 10 microns, it only absorbed 52% of particles smaller than 2.5 microns. In conclusion, when looking for an air purifier that is reliable and effective at removing airborne particulates from your home or office space, our top pick is BlueAir Blue Pure 211+ Auto for its performance in Auto mode as well as its affordability. For those looking for something more powerful with smart features included, Levoit 400S is our best selection with its intuitive interface and ability to capture at least 99.5% and up to 100% of particles during testing. For those looking for something more compact or affordable for small spaces or bedrooms, Coway-AP-1512HH or Levoit H132 are great options. Finally, if you're looking for something lightweight and compact enough to take on the road with you then KOIOS EPI810 could be your best bet.