What's the difference between fog and smog?

If the air near the ground is cooled to a certain extent under the conditions of sufficient moisture, breeze and stable atmosphere, the moisture in the air will condense into tiny water droplets suspended in the air, which will reduce the visibility of the ground. This weather phenomenon is called fog.

Smog/haze (wámáI in English) is a combination of fog and haze. Smog is very common in cities. In many areas of China, "haze" and "fog" are combined as disastrous weather phenomena for early warning and forecasting, which are collectively called "haze weather". In recent years, due to the deterioration of air quality, the smog phenomenon has increased and the harm has increased. When encountering foggy weather, try to take preventive measures, such as wearing a mask, and try to avoid outdoor activities.