The Air Vida M1 effectively improves the air environment around the face with abundant negative ions against airborne substances (PM2.5 and secondary smoke of pollen cigarettes).Just wearing the Air Vida M1 at all times, it will continue to improve the air environment in your home and office, as well as in buses, trains, in your car, restaurants, concert venues, and other places where many people gather together. The Air Vida M1 is more effective for indoor use (because it is less air flow and less negative ions are uncontrolled), but it will improve the air environment around you by simply putting it on at all times.