Those four cities are called fire cities?

The origin of the Four Great Furnaces (Wuhan, Nanjing, Chongqing, and Nanchang). Wuhan, Nanjing, Chongqing, and Nanchang are often referred to as the "Four Great Furnaces" in China. From the analysis of historical meteorological data, these four cities have frequent hot weather in summer, high nighttime temperatures and high air humidity. According to experts from the Nanjing Institute of Catastrophic Weather and Climatology, scientifically, the number of days with high temperatures above 35°C is used to measure the heat of a city. Cities such as Nanjing, Chongqing, Wuhan, and Nanchang are indeed at the top of the list for high-temperature days every year. According to statistics, the four major cities have an average of 19.3 days per year of high temperatures above 35°C in summer, and an average of 4.5 days per year of high temperatures above 37°C; an average of 13.2 days per year of minimum temperatures above 28°C at night, and an average of 13.2 days per year of minimum temperatures above 30°C every year. 1.9 days. Coupled with the sweltering heat of "no wind in the city", it is no wonder that it has the name of "stove". Chongqing's heat originates from its topography. "Yulu" can be called an old mountain for alchemy, and is a famous midsummer high-temperature area in the country. This year, the high temperature in Chongqing is slightly milder than that in the north. The heavy rainfall in early June has eliminated some of the heat in Chongqing in early summer, but Chongqing people are not grateful for this. Mr. Han, who lives in Yongchuan, Chongqing, said: "Chongqing's signature dish is the summer season from July to August, and the finale is the autumn tiger in September. This year's high temperature has not yet begun." Experts explain that the mountain city's rainy summers are the result of industrialization: "Industry The increase in emissions (sulfur dioxide, fine dust, etc.) affects solar radiation, leading to an increase in precipitation and a relative decrease in high-temperature days. "Such "artificial rainfall" is to a certain extent an "unexpected gain" from environmental pollution. Jiangcheng Wuhan can be called "the leader of the generation". There are many rivers and lakes here, and a large amount of water vapor evaporates. The hot air covers the entire city. On the one hand, it slows down the radiation of heat from the ground to the air. On the other hand, it makes it difficult for the surface of the human body to dissipate heat. It is like a sauna, sweating like pulp, and the heat is unbearable. On a certain day in 1934, Wuhan's record of 41.3℃ earned Jiangcheng the title of "Head of Furnace". Nanjing has learned the essence of Jiangnan's "Xia Jiujiu": don't leave your hand with the fan, sweating is like taking a bath. The high temperatures in Nanjing and Shanghai are comparable, but Shanghai's seaside terrain makes Nanjing feel inferior. "Due to the difference in air pressure between the sea and the land, Shanghai is much cooler than Nanjing at night. Although the daily maximum temperatures in the two places are similar, the average daily temperature in Shanghai is lower." ” explained Professor Qian from the Department of Atmosphere, Nanjing University. Historically, Chongqing, Wuhan, and Nanjing were firmly seated as the top three "furnaces", while the ownership of the "fourth furnace" has always been controversial. Nanchang, Jinan, Shanghai, Guangzhou and other places were all on the list. In the end, Nanchang finally Win. In the summer of 2003, there were 22 days in Nanchang when the daily maximum temperature reached or exceeded 39.7℃, and the maximum ground temperature exceeded 60℃. Citizens jumped into the Ganjiang River to cool off, and thousands of people swam in the river every day. In November of the same year, it was late autumn, and the highest temperature in Nanchang reached 31.2°C on one day. At present, many "stove cities" are asking to be removed, but Nanchang is the only one that has not yet applied.