The topic of indoor air pollution is not often talked about, but it is also of great concern. We should realize that in poorly ventilated rooms, especially if there are people smoking in the room, the pollution problem can be even more serious than outdoor air pollution. According to the survey statistics of the World Health Organization, the number of people who die from indoor pollution has reached 4 million per year all over the world, while the number of deaths caused by indoor pollution in our country is as high as 111,000 per year, which is about 304 people per day. Due to the deterioration of the indoor environment, our lung cancer incidence rate is increasing at an alarming rate of 26.95% per year; 90% of the current leukemia and indoor air pollution has a direct correlation; due to renovation of the upper respiratory tract infections caused by pollution leading to a major disease in children about 2.1 million people. The importance of indoor air quality can be seen. In the U.S., the main sources of indoor air pollution of concern are ammonia leaching from the ground and tobacco particles. For expatriates, the most important sources of indoor pollution are chemicals in building materials, paints, and alloy additives; and poorly ventilated outdoor atmospheres are also a contributing factor to indoor pollution. During the dry weather season, mold and bacteria grow relatively slowly. However, when people use humidifiers and don’t clean them often or clean them unreasonably (which becomes a breeding ground for bacteria), mold and bacteria become a big problem. In addition, for many people in Beijing, especially in the townships, indoor coal burning and pollution from smoking are the biggest threats. Generally speaking, tobacco is one of the most harmful and easy to deal with (no indoor smoking!). Tobacco is generally one of the most harmful but also one of the easiest to deal with (ban indoor smoking!). There is overwhelming evidence that indoor tobacco and the 4,000 chemicals produced by smoking have serious long-term and short-term effects on children’s health. It is estimated that 200 million women and children in China are affected by indoor smoking. Again, you can effectively control this by making lifestyle changes. 1. Individuals can protect the health of others by remaining smoke-free indoors and quitting smoking, and by getting help from health professionals when needed. 2. Protect the health of your family, guests and servants by building a smoke-free home; if you smoke, minimize the number of cigarettes you smoke. 3. Consciously patronize smoke-free restaurants, of which there are hundreds in Beijing alone, and tell the person in charge of the restaurant why you appreciate a smoke-free environment. If someone is smoking in a restaurant or bar, ask to be seated in a smoke-free area; if there is no smoke-free area, tell the person in charge that you will not come back until they provide a smoke-free and healthy environment. 4. Don’t give cigarettes as gifts – that’s giving away disease and death – and don’t let smoke. For regulating indoor air pollution, including protecting the indoor environment as mentioned below, medical experts provide a lot of important information. 1. Make it clear that the home is a smoke-free zone. Secondhand smoke inhalation, especially for children, can cause serious health problems. For smokers, invite them to smoke outdoors. 2. Good ventilation will reduce indoor environmental pollution. And to maintain good ventilation, open the doors between rooms most of the time. Open windows frequently to ensure the timely supply of fresh outdoor air. In the bathroom can be installed extractor fan to get rid of moisture and bacteria. 3. If necessary, install dehumidifier or air conditioner to reduce humidity. And, clean it regularly so that it does not become a breeding ground for pollutants. Regular water flow and higher humidity will breed mold and other pollutants, so it is important to repair all small holes and cracks in the house in a timely manner. 4. To prevent leaks of the toxic gas carbon monoxide, have a technician supervise all combustible equipment annually. And install a carbon monoxide detector near your living room. 5.Clean up dust mites and other allergens regularly. Wash bedding and household items at high temperatures (≥130°C). Consider replacing large rugs with smaller rugs that are easy to clean. 6, you can give your gas tea set with a piece of hood sealed fan for exhaust. When cooking, open the fan or window to vent the smoke. 7.Check whether detergents and insecticides contain toxic ingredients and use them according to product instructions. When using the above products, keep the room well ventilated and consider using less irritating alternatives.