But in fact, miasma not only refers to some toxic gases, but also includes mosquitoes carrying infectious diseases such as malaria. They are small in size and large in quantity, and it is easy to mistake them for black toxic gases from a distance.
It is worth mentioning that miasma, which the ancients called miasma, not only refers to the physical qi, but also refers to the diseases that cause physical discomfort. As for the causes of the disease, some are adverse physical reactions caused by inhaling toxic gases or moisture, some are suffering from malaria after being bitten by mosquitoes, and some are just psychological effects. Northerners who get sick in the south will take it for granted that it is miasma poisoning, but in fact it may have nothing to do with it.