Air humidity refers to the degree with water. General indoor humidity to 50--60% suitable. But for different patients, the appropriate relative humidity do not like, such as bronchitis patients some high humidity. Asthma patients may be lower. High temperature, evaporation weak, can inhibit sweating, and patients were moist, energetic, urine, and conducive to microbial growth. Low humidity, dry air there, the body of water evaporation, have dry mouth, Guasao, throat tightness, and so on. Air conditioners adjust humidity is the best way. The humidity is too high, they can open the windows for air circulation; Low humidity, watering the ground. Winter, the heating furnace or placed on the pot, water vapor by evaporation to raise humidity.