Coway uses its own air-quality color-coding system, but the Mighty2 uses different colors than the OG Mighty model. The air quality light now flashes blue for clean air, green for moderate, orange for unhealthy and red for very unhealthy. COVE’s color-coding system is a bit confusing, given that it varies from American Air Quality Index standards – green for good, red for unhealthy, and purple for very unhealthy. At a glance, I was often confused as to what the color was indicating about the air in my home. Using the built-in air sensor, Mighty2 automatically adjusts its fan speed (in Auto mode) in response to changes in air quality to purify the air most effectively.
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Photograph: Molly Higgins
When I tested, I used it mostly in my bedroom near my cats’ litter boxes; Near my living room window, which has a lot of outdoor exhaust and pollutants; And while cooking on my gas stove in my kitchen, which does not have proper ventilation. I tested this model for several weeks, walking around my house and letting the air purifier automatically adjust to different situations where the air quality became unhealthy from time to time. Although I used the Auto feature most often, I also tested the timer and sleep features, which worked as expected every time, and I appreciated the auto-enabled sleep mode in case I forgot to change the settings at night.
For all air purifiers, I manually test the air with my own air quality monitor in various conditions, and use a decibel monitor to measure how loud the purifier is at the highest setting. I also used a sealed tent and smoking pellets to see how quickly each air purifier cleared the pellet smoke inside the tent (and returned the air to a healthy quality) when in automatic mode. For the smoke test, it took 50 seconds for the Mighty2 to visibly clear the smoke, and three minutes and 20 seconds for the built-in air quality sensor light to read that the air had returned to a healthy state on Auto mode (red to blue indication light). In a test with the slightly cheaper Levoit Vital 200S, smoke cleared in about 40 seconds and took four and a half minutes to read back as healthy air. Although the stats are comparable, the Mighty2 was slightly faster overall. However, I really appreciated Levoit’s app for checking the air quality and purification via my phone (since the purifier was visibly covered in smoke), and the app notifying me when it reached clean air conditions again.
According to my decibel reader, the Mighty2 was hovering around a moderate 65 to 70 dB on the highest fan setting, and about 35 dB on sleep mode, not even registering on the reader above the ambient noise of my home. For reference, a refrigerator hums between 40 and 50 decibels, and conversation is around 60 decibels. Even at the highest setting, it didn’t sound overly loud and provided white noise. Ideally, an air purifier should be able to clean the air in your room five times an hour without reaching conversation noise levels. On Auto mode and Sleep mode, fan noise was virtually unknown.
If you’re a fan of Coway’s air purifiers, or are looking to upgrade your air purifier from a previous model, the Mighty2 is a solid choice. It’s only $30 more than the previous model, can effectively purify more square feet per hour, and its filters last twice as long as the previous model. The upgrade to Mighty2 will pay for itself in just one year of use through the filter. It’s easy to clean and take apart, and the purifier helped keep down residual dust from my cats’ litter, reduce dander during shedding season, and improve the overall quality of air around their toilet/general living space.
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