AQI air quality indicates the influence of color on health. Suggested measures: 0-50 can exercise normally; 5 1- 100 beam 100-200; the symptoms of susceptible people with mild pollution are slightly aggravated. Patients with heart disease and respiratory diseases in healthy people should reduce physical exertion and outdoor activities. The symptoms of patients with moderate pollution heart disease and lung disease are obviously aggravated, and their exercise tolerance is reduced. Elderly people with common symptoms and patients with heart disease and lung disease in healthy people should stay indoors and reduce physical activity > 300 heavily polluted healthy people have decreased exercise tolerance and obvious strong symptoms. The elderly and patients with certain diseases in advance should stay indoors to avoid physical exertion, and the general population should avoid outdoor activities.