1. Affect respiratory system

The composition of smog is very complex, among which the main health hazards are aerosol particles with a diameter less than 10 micron, such as sea salt, sulfate, nitrate, fuel, automobile exhaust, etc., which can directly enter and adhere to human respiratory tract and alveoli.

2. Calcium deficiency

Hazy days will block sunlight and weaken the ultraviolet rays on the surface. Without sunlight, people's body surface can't convert cholesterol in the skin into vitamin D, which in turn affects the absorption and utilization of calcium and phosphorus.

3. Disturb the human nervous system

Simplicity can make people lazy, depressed, disappointing, and unpleasant things are out of control.

Hurt your heart

The School of Public Health of Harvard University has confirmed that particulate pollutants on cloudy days will not only cause myocardial infarction, but also cause myocardial ischemia or injury. The United States asked 25,000 people with heart disease or bad heart, and found that with the increase of PM2.5, the mortality rate of patients would increase by 10 μ g/m3.

Harm the skin

Skin also has respiratory function. In clean air, the skin will be very comfortable and moist, but in dirty environment, the skin will be very uncomfortable.