What is "smog"? What's the harm to people? How to read it?

Haze is a weather phenomenon in which a large number of tiny dust particles, smoke particles or salt particles are suspended in the atmosphere, which makes the air turbid and reduces the horizontal visibility to below 10 km.

Smog weather is not good for the health of patients with chronic bronchitis and asthma. After staying in this air for a certain period of time, the symptoms of patients with heart disease and lung disease will be obviously aggravated, and healthy people will also have uncomfortable symptoms.

Because most of the "atmospheric aerosol" in smog can be inhaled by human respiratory tract, especially submicron particles will be deposited in upper and lower respiratory tract and alveoli respectively, which will cause rhinitis, bronchitis and other diseases, and it will also induce lung cancer in this environment for a long time.

Read "Mai" twice.