Hotels in plateau areas must turn on exhaust fans

Does the subject want to ask "Why do hotels in plateau areas have to turn on exhaust fans"? The air is thin. According to the information of Sina. com, the air in the plateau area is thin and the oxygen content is low, so people often have altitude sickness. Turning on the exhaust fan can help increase indoor air circulation, improve indoor oxygen content and relieve the symptoms of altitude sickness, so the exhaust fan must be turned on in the plateau area.