DREW Air Purifier - PURE 3+SIMPLE SOLUTION FOR YOUR HEALTHIER LIFESTYLE Your Air Quality in Glance of Colors Constantly measure the air quality and let you know the air condition with light indicator, so you're aware and can make improvements to your living space with auto mode. Good (White) Air quality is considered satisfactory and air pollution poises little or no risk. Moderate (Yellow) Air quality is acceptable. However, for some pollutants there may be a moderate health