The weather is gloomy.

Fog is a water vapor condensate composed of a large number of tiny water droplets or ice crystals suspended in the air near the ground, which is often milky white, making the horizontal visibility less than 1 km. Haze refers to the phenomenon that a large number of extremely fine particles float evenly in the air, which makes the air with horizontal visibility less than 10 km generally turbid. These particles mainly come from nature and human activities. Haze will make bright objects in the distance slightly yellow and red, and dark objects slightly blue.

The main differences between fog and haze include: First, the visibility range is different. The horizontal visibility of fog is less than 1 km, and that of haze is less than 10 km. Second, the relative humidity is different. When fog appears, the relative humidity is supersaturated, and when haze appears, the relative humidity is low. Third, the time of appearance is different. Fog is most likely to appear from midnight to early morning; The diurnal variation characteristics of haze are not obvious, and it is easy to appear when the air mass is stable. Haze is a special weather phenomenon. Non-aqueous substances such as dust, sulfuric acid, nitric acid and organic hydrocarbons in the air make the atmosphere turbid, blur vision and worsen visibility. If the horizontal visibility is less than 10000 meters, it will cause sight distance obstacle.

Tian # Cat USA Import Puweixin Tip: Remember to protect yourself when traveling in foggy days.