Cyclo Airstream UV Air PurifierHow does the portable air purifier clean the air? It has one filter which contains three sections of filters: prefilter, an activated carbon filter and a high performance HEPA H13 filter. The pre filter works on your larger airborne particles. The activated carbon filter traps your indoor odors. The HEPA filter works for all particles, which would filter up to 99. 75% of the air. The ultraviolet light (UVC) will attack the microorganisms at the