Many places in Shandong have issued fog warnings! Why do smog weather often appear in winter?

Many places in Shandong issued fog warnings. In winter, foggy weather may appear more frequently. This is because the temperature in winter is relatively low, there is more water suspended in the air, and solid dust is more likely to condense in the air, thus forming foggy days. Fog generally refers to fog, especially water vapor, which will dissipate with the appearance of the sun, but haze will not dissipate with the appearance of the sun. Fog is a normal natural phenomenon in nature, and haze is an aerosol system produced by industrial waste and automobile exhaust, which will cause visual impairment, so haze is also called haze.

First, fog is water vapor, which is harmless to human body. Fog is small water droplets suspended in the air, which reduces the visibility of the ground. Usually, when the water vapor is sufficient, the breeze or the atmosphere is stable, the temperature is around zero, and the relative humidity is high, the water vapor in the air will condense into tiny water droplets suspended in the air, blocking people's sight. But after the sun comes out, this small water droplet is evaporated, so the fog will disappear with the appearance of the sun. Foggy days often appear in February, March and April in spring. The formation of fog requires four conditions, cooling and humidification.

Second, smog is particulate matter suspended in the air. Haze is very different from fog. Haze is called haze because of drowsiness in the air and an aerosol system composed of particles such as sulfuric acid and nitric acid. Haze is composed of some particles, so these fixtures will not disappear with the appearance of sunlight. And compared with fog, smog is harmful to people's health. However, because the appearance of haze and fog will reduce the visibility of the ground, they often appear together.

3. Similarities and differences between fog and haze. Fog and haze will reduce horizontal visibility, but have a great impact on people's lives, especially in traffic, so we must pay attention to driving safety. However, fog is composed of water vapor, which generally only appears before sunrise in the morning and is not harmful to people's health. Haze will form at any time and will not disappear with the appearance of the sun, which is very harmful to people's health, so you must wear a mask when traveling in foggy weather.