How did London's foggy phenomenon form?

London is the world-famous "Fog City". It is famous for its frequent heavy fog in autumn and winter. Although the heavy fog in London brought difficulties to transportation and navigation, it was not without its merits. During World War II, the heavy fog played a great role in protecting the city and eliminating fascism.

At the end of July 1940, fascist Germany attempted to launch an air offensive against Britain. The German Air Combat Command mistakenly believed that the heavy fog in London could restrict the take-off of British aircraft; the chimneys protruding above the fog could be used as attack targets. However, every time the Luftwaffe fleet took off, it was either intercepted by a strange "bomb net" midway, or it was violently attacked by the British Air Force before it could all take off. Several sneak attacks ended in failure.

Once, the German Air Force took off immediately after receiving a weather report of heavy fog in London. But before arriving in London, the fleet lost contact due to thick fog, making it difficult to see the direction. As a result, they were shot down by British planes following the fog, causing heavy casualties. Most of the fleet was buried in the belly of the fish.

It turns out that both Germany and Britain are under the control of the westerly belt, and their weather changes develop from west to east. Britain is just in the west of Germany, so it is easy to predict the weather changes in Germany, while Germany does not. Unable to gauge weather conditions in the UK. In this way, the British took an active offensive using the measurable German weather forecasts.

On foggy days, the British used the fog curtain to prepare for battle. When the fog area moved eastward, the British aircraft followed the fog to intercept the German aircraft. Sometimes, heavy fog was used as a barrier. In the fog-shrouded section of the German plane's route to the UK, planes dropped a large number of bombs tied under parachutes with 100-meter-long wires, forming a "bomb net" on the route.

Because the bomb was suspended under a hundred-meter-long wire and protected by heavy fog, it was difficult for aircraft to detect it. This bomb once terrified German pilots. Because bombs are always accompanied by heavy fog, they are called strange fog bombs.

Fog is small water droplets floating in the low sky. When the temperature of the water vapor-containing atmosphere near the ground drops and the water vapor in the atmosphere exceeds saturation, the excess water vapor condenses into small water droplets near the ground and at low altitudes, thus forming fog.

In addition, because London is located in the Atlantic Ocean in western Europe, it happens to be at the intersection of the Gulf Stream, which contains a large amount of water vapor and high temperatures, and the cold, dry East Greenland Current. The air mass on the Gulf Stream is warm. Wet and light, when it rises along the slope of the dry, cold, heavy air mass above the cold current, due to the decrease in temperature, water vapor condenses near the ground to form thick frontal fog.

This is why London is foggy. It was this thick fog that made a "miraculous contribution" to the defense of London.

Between December 5 and 9, 1952, the London smog incident killed 4,000 people. As a result, the government implemented the Clean Air Act in 1956, banning the use of smoke-generating fuels in some areas of London. . Since the 1980s, London's air quality has been significantly improved due to a series of measures taken by the British government.