What's the difference between fog and haze in weather forecast? What kind of fog can be called haze?

Haze, also known as haze, refers to the turbidity caused by the suspension of a large number of particles such as smoke and dust. The core substance of smog is dust particles suspended in the air, which are called aerosol particles in meteorology. At present, the research focus of aerosol particles is PM2.5

Fog is a kind of weather phenomenon, which is called fog, when the air near the ground cools to a certain extent and the water vapor in the air condenses into tiny water droplets suspended in the air, which reduces the visibility on the ground.

To sum up, haze is caused by solid particles in the air, and fog is caused by suspended water droplets in the air. Hazy days have a great impact on human health, especially PM2.5, which is currently hotly debated, and it is the cause of many respiratory diseases.