According to the experts' research and analysis, the incidence rate of asthma in children is 2%-5%, and the incidence rate of asthma among children under five years old and below is 85%. It is urgent to pay attention to the health of children and to deal with the harm caused by environmental pollution to children. Urban residents in China study and work and live indoors every day, which lasts more than 20 hours, which can account for more than 90% of the whole day time. The indoor environmental pollution degree is usually many times higher than outdoor pollution. Generally speaking, the main objects of this harm are children, pregnant women and the elderly and the weak, especially children, who are more vulnerable to the related hazards. Because the young people and children are in the growth and development period, their physiological function is not mature enough, and their breathing capacity is about 50% higher than that of adults.