What are the hazards of smog to the human body?

In my impression, smog is very harmful to human health, and its impact on human health mainly includes the following aspects:

respiratory system

cardiovascular system

eye

immune system

genital system

Therefore, it is suggested to minimize outdoor activities in foggy days, especially for the elderly, children and patients with respiratory diseases. At the same time, wearing a mask can reduce the impact of inhaling smog.