Will there be smog in Shanghai tomorrow?

It will be foggy in Shanghai tomorrow.

From midnight today to tomorrow morning, there will be low visibility weather in this city, with dense fog with visibility less than 500 meters in most areas and less than 200 meters in some areas; At the same time, the weather process of PM2.5 pollution is superimposed. It is expected that there will be light to moderate haze from tonight to noon tomorrow. As the wind turns southerly, the air quality will gradually improve tomorrow afternoon. In addition to fog and haze, weak cold air will also bring down the temperature. Tomorrow morning is the coldest morning in recent years. The lowest temperature in the urban area is 2℃, and it is -3℃ to 0℃ in the suburbs, with freezing or thin ice.

In addition, the Shanghai Central Meteorological Observatory issued a yellow fog warning signal at 0 19: 20 on October 3, 2024: due to radiation cooling, it is expected that fog with visibility less than 500 meters will appear in most suburbs of the city from midnight today to tomorrow morning, and visibility less than 200 meters in some areas. Please pay attention to prevent the adverse effects of low visibility on road traffic.

Haze refers to:

Haze, as its name implies, is fog and haze. But there is a big difference between fog and haze. The aerosol system composed of dust, sulfuric acid, nitric acid and other particles in the air causes visual impairment, which is called smog. Haze is haze.

Fog is an aerosol system consisting of a large number of tiny water droplets or ice crystals suspended in the air near the ground. It mostly occurs in autumn and winter (which is also one of the reasons for the large-scale haze weather in China in June 20 13), and it is the product of water vapor condensation (or condensation) in the near-surface air. The existence of fog will reduce air transparency and worsen visibility. If the horizontal visibility of the target drops below 1000 meters, the weather phenomenon of water vapor condensation (or condensation) suspended in the air near the ground is called fog.

If the horizontal visibility of the target is 1000 ~ 10000 meters, this phenomenon is called light fog or mist. When fog is formed, the atmospheric humidity should be saturated (if there are a large number of condensation nuclei, the relative humidity may not reach 100%, and saturation may occur). Because the light scattered by fog composed of liquid water or ice crystals has little to do with wavelength, the fog looks milky white or bluish white and gray.

The above contents refer to Baidu Encyclopedia-Smog