Haze and fog are different in composition, relative humidity and maintenance time.

1, different components.

Fog is a liquid particle of water droplets suspended in the air, with a diameter of 5 to 100 micron. Haze is composed of dust particles, smoke particles or salt particles, and its diameter is between 0.00 1 ~ 10 micron, commonly known as PM2.5

2. The relative humidity is different.

Fog is a phenomenon of water vapor condensation, which requires high relative humidity, generally above 90%. Haze is a collection of dust particles, smoke particles or salt particles, and the relative humidity of the air is mostly below 80% when it is formed.

3. The maintenance time is different.

Fog has the characteristics of locality and short time, and its concentration changes rapidly when it is formed. Haze has a gradual formation process, which can last for several days and has the characteristics of large-scale and uniform visibility in all directions.

Hazards of fog:

1. The air pollution in foggy days is much more serious than usual. The particles that make up the fog core are easily inhaled by people and easily left in the human body. The amount of air inhaled during exercise is much more than usual, and a lot of particulate matter will be inhaled in foggy days, which further aggravates the harm of harmful substances to human body.

2. Being in this environment for a long time, the human body will inhale harmful substances, consume nutrients, cause internal injuries to the body, and easily induce or aggravate diseases.

3. People with environmentally sensitive diseases, such as bronchial asthma, pneumonia and other respiratory diseases, will hinder normal blood circulation, leading to cardiovascular diseases, hypertension, coronary heart disease, cerebral hemorrhage and so on.