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The Very Best Air Purifiers In 2021

The Core 300 replaces our former spending budget pick, the Blueair Blue Pure 411, which the Core 300 outperformed considerably. To test air purifiers, we inject smoke and dust particles into a sealed chamber and measure how nicely each model removes particles in between .1 and 1 micron. (Human hair has a diameter of one hundred microns.) We use a particle counter to measure the change in particle concentration as the air purifier runs for 15 minutes at the highest speed, and then at a decrease speed. And for the reason that these run day and night, we measure noise levels, in decibels, at each speed, and calculate annual operating charges for filter replacements and energy use to run the machine 24 hours a day.
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