In a launch presentation in Tokyo, Japan, Dyson tackled the surprisingly sketchy hygiene issues that come with more typical humidifiers. To prove how gosh-darn better Dyson’s Hygienic Mist humidifier is, the company’s microbiology team incubated water with bacteria to see how a typical humidifier transmits that to a room. A selection of agar jelly plates grossly demonstrated how that bacteria spreads around a room. However, in an early comparison, with the same concentration of bacteria in the water, Dyson’s test humidifier, with UV light cleansing the water, knocked out 99.9 percent of the bacteria.