... by the body , the effective prevention of the "Air conditioning disease” .2. improving pulmonary function: Human inhalation ... , formaldehyde , benzene , ammonia , TVOC, and other harmful air chemicals , environmental health visible .7. Eliminate smoke and dust: ... , warehouses, hospitals, nursery , nurseries , any indoor place of fresh air can be applied .Negative oxygen ions generated test: >3,000 ...