"220V Cooling Fan" in the smaller size of the fine particles of pollutants to human health, the greater the potential hazards; particulate air pollutants are caused by allergic reactions and inflammation of the culprit. Worse result, "220V Cooling Fan" in diameter down to PM0.1 particles also may enter the blood vessels, and with the blood circulation flow to various organs inside the human body, increasing severe acute and chronic disease risk. Dyson Pure Cool air purifier "220V Cooling Fan" with the top glass filter, not only to achieve the purification of PM2.5 particles, it can purify up to ultrafine particles PM0.1.