Dyson's most advanced filtration system combines a precise, solid-state formaldehyde sensor with a unique catalytic filter that continuously destroys formaldehyde. An activated carbon filter removes gases and odors and a HEPA filter captures 99.97% of particles 0.3 microns in size. And Dyson purifiers have powerful Air Multiplier technology to purify the whole room. Third party full machine testing based on GB/T 18801-2018 formaldehyde cumulative clean mass testing with continuous injection unti