The benefits of fog:
Fog is ever-changing and complicated, but it is nothing more than radiation fog and advection fog. Although there are various phenomena, the essence is the same: water vapor condenses when it meets cold. Sometimes fog indicates sunny days, sometimes fog indicates rainy days, and it looks chaotic. However, as long as the characteristics of radiation fog and advection fog are mastered, observed in many aspects and carefully analyzed, the laws of fog, sunny and rainy weather can be accurately grasped, and the weather can be predicted. This is very useful for agriculture, transportation, aerospace and navigation.
Fog is closely related to future weather changes. Since ancient times, the working people in our country have known this truth, and it has been reflected in many folk proverbs. For example, "Huangmei is foggy, rocking the boat doesn't ask for directions." This means that the fog at the turn of spring and summer is a harbinger of rain, so people also have the saying of "summer fog and rain". Another example is: "I can't see anyone in the fog, so I dare to wash my clothes." This means that winter fog is sunny, and so is autumn fog.
To accurately understand the sky through fog, we must also look at the duration of fog. Radiation fog is caused by cold weather and water vapor condensation, so it disappears when the temperature rises during the day, and the weather is fine; On the other hand, "fog is rain." If the fog doesn't disperse during the day, it may rain the next day, so the folk proverb says, "The fog doesn't reach noon, and the rain will ring after noon."
Hazards of fog:
Fog is one of the weather that has the greatest influence on human traffic activities. Because visibility is greatly reduced when there is fog, many public transport vehicles, such as airplanes, cannot be used. Or the use efficiency is reduced, such as cars and ships.
Some people keep on exercising. No matter what the weather is like, they never stop. In fact, persistence is a good thing, but it is not necessarily right to persist every day. For example, exercise in foggy days is not worth the loss. In foggy days, the combination of pollutants and water vapor in the air will make it difficult for pollutants to spread and settle, which makes most pollutants gather at the height where people often move. Moreover, some harmful substances will become more toxic when combined with water vapor, such as sulfur dioxide becoming sulfuric acid or sulfite, chlorine hydrolyzing into hydrogen chloride or hypochlorous acid, and fluoride hydrolyzing into hydrogen fluoride. So the air pollution in foggy days is much more serious than usual. Another reason to emphasize is that the particles that make up the fog core are easy to be inhaled and stay in the human body. The amount of air inhaled during exercise is much more than usual, and a lot of particulate matter will be inhaled in foggy days, which further aggravates the harm of harmful substances to human body. In a word, the harm of foggy exercise to the body is greater than the benefit of exercise. Therefore, it is not suitable for exercise in foggy days.