With a cleaning capacity of up to 1,256 square feet, this unit can cycle through the air even in larger spaces like art galleries, offices, or loft apartments. A true HEPA filter (which the U.S. Department of Energy defines as a filter that removes at least 99.97 percent of airborne particles 0.3 micrometers in diameter) and an activated carbon filter work together to collect particles, reduce over 99 percent of your air’s volatile organic compounds (VOCs), and lessen fumes from ammonia and the carcinogen acetaldehyde. The pre-filter (which traps large particles) can be washed and does not need to be replaced. When it’s in smart mode, the purifier will adjust its fan speed based on conditions. An LED ring shows you how your air rates at all times—and may offer unrequested feedback on your culinary skills.