How did London get its nickname?

The City of London is often full of wet fog, so it has another name called "Fog City" (or "Fog City"). At the beginning of the 20th century, most people in London used coal as household fuel, which produced a lot of smog. These smog, together with the climate in London, caused the "well-known" smog in London, which is called LondonFog in English. Therefore, English sometimes calls London "TheSmoke", hence the name "Fog Capital". 195212 from February 5 to 9, the fog and haze incident in London caused 4000 deaths. Therefore, the government implemented the Clean Air Act in 1956, prohibiting the use of smog-producing fuels in some parts of London. Since the 1980s, due to a series of measures taken by the British government to strengthen environmental protection, the visibility over London has improved and the average annual sunshine has greatly increased. Birds that have been extinct for many years are soaring over London again. Today, the air quality in London has improved significantly.

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. Fog is actually formed by small water droplets attached to dust in the air, so more fog means more dust in the air (such as "fog capital" London), which is harmful to people's health.

The air pollution in foggy days is much more serious than usual. The particles that make up the fog core are easily inhaled by people and easily left 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 this environment for a long time, the human body will inhale harmful substances, consume nutrients, cause internal injuries to the body, and easily induce or aggravate diseases. In particular, some people with environmentally sensitive diseases, such as bronchial asthma, pneumonia and other respiratory diseases, will have normal blood circulation obstruction, leading to cardiovascular diseases, hypertension, coronary heart disease, cerebral hemorrhage and so on.

Experts suggest that people should be less active outdoors in foggy days, and wear scarves and masks outdoors to protect their skin, throat and joints, especially middle-aged and elderly people, children and people with weak constitution. 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.