Is the weather quality good or bad when it is foggy in the morning?

Fog and clouds are formed by condensation of water vapor, but the bottom of the cloud does not touch the ground, while fog touches the ground. Therefore, it can be said that fog is a cloud on the ground.

According to different horizontal visibility, fog can be divided into heavy fog, dense fog, dense fog, medium fog and light fog. The horizontal visual distance of fog is less than 50 meters; The horizontal visual distance of dense fog is between 50 and 200 meters; The horizontal visual distance of fog is between 500 ~ 1000m, and the visual distance of light fog is above 1000m.

According to different causes, fog can be divided into radiation fog, advection fog fog, steam fog, uphill fog and frontal fog fog. Radiation fog is formed after the ground air is cooled by radiation at night and reaches the supersaturated state of water vapor. This kind of fog often appears in sunny nights and mornings when the wind is blowing gently and the water vapor near the ground is sufficient. The appearance of radiation fog generally indicates that the weather will be fine that day, so there is a saying of "ten fogs and nine sunny days". Advection fog is caused by horizontal airflow. When warm and humid air flows through the cold ground or sea surface, the lower layer of air cools due to contact with the ground or sea surface, so that water vapor condenses into fog. The appearance of advection fog usually indicates that it will rain in two or three days. Frontal fog originated from the confrontation between cold and warm air masses. This kind of frontal fog often appears in rainy season in China, and it is also a sign of rainy weather.

Fog has a great influence on navigation, aviation and crops. For example, once the sea navigation encounters dense fog, the ship may lose its way, even hit the rocks, run aground, collide and other accidents; It is difficult for an airplane to take off or land in foggy weather; In foggy and cold weather, the yield and quality of crops will be affected.

Diffuse fog is a common weather phenomenon in early winter. Such fog not only affects traffic and brings inconvenience to people's travel, but also does a lot of harm, which should be highly valued by people.

Fog is the condensation of water vapor in the air. According to the measurement, the proportion of harmful substances such as acid, alkali, salt, amine, phenol and pathogenic microorganisms contained in fog drops is several times higher than that of ordinary atmospheric water drops. The harm of fog to human health is very hidden. The diffuse fog and picturesque scenery attract people to exercise and play in the fog. With the increase of activity, people's breathing will inevitably deepen and accelerate, and naturally absorb more harmful substances in the fog, which is easy to induce or aggravate many diseases such as tracheitis, pharyngitis and conjunctivitis. Therefore, outdoor activities, especially some strenuous activities, should be stopped as much as possible in foggy days. Be sure to travel and take good protection.