What are the damages of haze to the body? To understand what damage haze can do to your body, you first need to know what haze consists of. Haze is made up of a series of floating particles of varying sizes, including larger and smaller particles such as PM2.5. Among them, there are larger particles and smaller particles such as PM2.5. The most damaging to the human body, and also the most subtle, is PM2.5. When we breathe, the haze will be inhaled into our respiratory tracts, and the larger particles will be blocked by the human body’s nasal passages, trachea, bronchial tubes, and fine bronchial tubes at all levels, which can cause inflammation of our upper respiratory tract. PM2.5 is inhaled directly into our alveoli due to its very small diameter and is processed by alveolar epithelial cells. Some of it is dissolved and digested, some of it is processed and absorbed into the bloodstream, and some of it is permanently deposited in the alveolar epithelium. Since PM2.5 is an industrial exhaust gas, it contains many kinds of bad chemicals such as heavy metals and aromatic compounds. Under the long-term stimulation of PM2.5, our lungs will undergo chronic inflammation, alveolar epithelial cells will die, and will become cancerous. This is the effect of haze on the respiratory system. When the haze is absorbed into the blood, some of it will be deposited in the walls of the blood vessels of the cardiovascular and cerebrovascular vessels, thus triggering the occurrence of cardiovascular and cerebrovascular diseases. This is why the incidence of cardiovascular disease increases when the haze is severe. Of course, theoretically speaking, the haze absorbed into the bloodstream may be deposited in various organs of the human body, causing corresponding damage. For example, it can lead to an increase in blood viscosity, inducing thrombosis, which, combined with deposition in the endothelium of blood vessels, can cause heart attacks and cerebral infarction. For example, PM2.5 contains many heavy metals and aromatic compounds, which can affect the human reproductive system, affect pregnant women, and even through the placenta to affect the development of the fetus. Of course, since the human body has a very strong compensatory capacity, not all organs will have clinical manifestations. To summarize, the damage of haze to our body, the first to bear the brunt of the respiratory system, followed by the cardiovascular system, which is also consistent with our usual feelings. Once the haze day, we will cough more, the incidence of heart attack and cerebral infarction will rise. However, these manifestations are superficial and perceptible, and they will attract attention. In fact, I think the biggest and most subtle damage of the haze is that it will cause cancerous changes in the alveoli. In the early stages, there are no symptoms of this change because there are no sensory nerves in the lungs. Most people find out about it occasionally, such as when they go to the doctor with a chronic cough and get a chest CT. This is the main reason why our incidence of lung cancer has been high and growing rapidly in recent years. Of course, there is no direct scientific evidence that PM2.5 has a direct causal relationship with lung cancer, but I have drawn my conclusions based on clinical observation and theoretical deduction.