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There is a very interesting phenomenon in China, at present, the richer places in China, such as Jiangsu, Zhejiang, Shanghai, Shenzhen, and Guangzhou, in ancient times, all had a unified name: the land of smoke and miasma in the south.
But in recent years, we have hardly heard that these places have anything to do with "miasma".
On the contrary, the north is often shrouded in thick haze, which makes people sigh what is called "feng shui turns".
We have already found out the source of the smog, most of which is due to industrial pollution and the severe weather phenomenon caused by the serious desertification in the north, so what is the miasma that has been prevalent in the south for thousands of years? Why did it suddenly disappear in modern times?
When it comes to miasma, under the influence of film and television works, most of the public's minds will come up with a thick fog floating in the mountains, rivers and forests, which is poisonous and can be fatal if inhaled.
But in the official explanation, miasma is actually a general term for a variety of diseases.
In order to give the reader a better understanding, we will explain the miasma into two categories: disease and toxic gases.
Ancient people Xi called the south a place of smoke miasma, saying that there will be miasma in the air in many places in the south, and if you smoke it, you will get sick.
During the Han Dynasty, Jiaozhi rebelled, and Ma Yuan led the troops to conquer, because after going deep into the south, he found that there were many miasma here, and many soldiers had not yet gone to the battlefield, so they suffered heavy casualties because of the miasma.
This account of miasma is also quite famous in history.
Later, various scientists and experts found that in fact, the southern miasma mentioned by the ancients was, in most cases, malaria.
The field of medicine in the ancients was not well developed, and it was not possible to distinguish the disease very well.
In the south, because of the humid and hot climate and the large number of trees, there are a large number of snakes, rats and mosquitoes, which can easily cause malaria epidemics.
In ancient times, people did not have many measures to protect and prevent mosquito and poisonous insect bites, so after entering the southern border, they would be bitten by mosquitoes or poisonous insects if they were not careful, and many of these mosquitoes carried viruses, which caused malaria and various diseases.
In the mountains and forests in the south, there is the most dense place for mosquitoes and poisonous insects, so over time, these places have become "forbidden areas for humans", and people are afraid to enter these places, and call these places the land of smoke miasma, and blame the diseases brought by mosquito bites on the miasma, thinking that they are sick by absorbing the miasma.
Nowadays, with the continuous improvement of science and technology and the continuous in-depth research in the medical field, people have discovered the harm of mosquito bites and made many preventive measures against them.
Such as vaccination, medicine, insect spray, etc., the emergence of these measures has greatly reduced the probability of people getting sick due to mosquito bites, and correspondingly, the so-called "southern miasma" has naturally disappeared.
On the other hand, the statement that there is a lot of miasma in the south is actually inherently exaggerated.
Most of the ancient centers of power on the mainland were in the north, and when punishing some officials, it was Xi to throw these people to the south, and the greater the mistake, the more south they went.
And in the frustrated mood, these people naturally don't have much good impression of the south, so most of them will compare the south to a particularly bad one, invisibly becoming a "regional black", and portraying the south as a dangerous place full of miasma.
But in fact, many places in the south are still very suitable for human habitation.
Then there is also the question, is there really such a gas in the south that can get sick if you inhale it?
The answer is: Yes.
Especially in the barren mountains and mountains, such gases do exist.
The environment that can give rise to this gas is mostly wooded and humid, causing a large number of plants to decay, and at the same time, after the death of animals, in this humid environment, the corpses decompose and breed fungi and a large number of bacteria.
If humans inhale air with a lot of fungi and bacteria, the body is also very susceptible to diseases.
Traditional Chinese medicine also mentions that even without these bacteria and microorganisms, humans are prone to illness simply by living in places with heavy humidity.
This is the saying that "dampness causes all diseases", and there is also the argument that the body can eliminate all diseases by removing dampness, which is not unreasonable.