First, indoor air pollution sources
1. Building and decoration materials.
2. Cigarette smoke.
3. Kitchen fumes.
Second, the health hazards of indoor air pollution
1. Respiratory diseases.
2. Diseases of circulatory system.
3. Nervous system diseases.
Third, methods to improve indoor air quality.
1. Choose environmentally friendly building and decoration materials.
2. Reduce the influence of cigarette smoke.
3. Strengthen kitchen ventilation and use range hoods.
4. Regular indoor air purification.