Pum is an abbreviation of Patikurat Matt, known in Chinese as Floating Particles

The main components are sulfate, nitrate, ammonia, sodium chloride, black carbon, mineral dust and water, and contains a complex mixture of organic and inorganic solids and liquids suspended in the air. Suspended particulates refer to tiny solid or liquid substances present in the air, such as dust, pollen, dust, smoke and small water droplets, etc., these substances come in different shapes and sizes, and the mainstream classification is less than or equal to 10 microns (μm) is called PM10, and less than or equal to 2.5 microns is PM2.5, also known as fine suspended particles. If you don't know how small a micron is, you can compare it to hair, which is about 70 microns in diameter, which is about 30 times larger than fine suspended particles.

Hazards of suspended particulate PM2.5

Generally speaking, the smaller the particles, the more harmful they are to the human body, as it is more difficult for the human body to stop them from entering. For example, 10 micron suspended particles can invade the body and adhere to the lungs, while fine suspended particles can even enter the bloodstream and circulate throughout the body with the flow of blood.

Fine particulate PM2.5, due to its small particle size, can penetrate deep into the alveoli and may reach the bronchiole wall, interfering with gas exchange in the lungs. Long-term exposure to suspended particulates can cause cardiovascular disease, respiratory disease, and an increased risk of lung cancer. (Top 3 causes of lung cancer: smoking, air pollution, genetics and medical history)

After the human body inhales aeroparticulates, the first to bear the brunt of the airway and the entire respiratory system, which can cause breathlessness, coughing and sneezing, and prolonged exposure to aerosols may increase the risk of asthma, heart disease, and lung disease, among which the elderly, children and pregnant women are at high risk of particulate damage.

High PM2.5 concentrations are as dangerous as toxic gases!!

To put it simply, the higher the concentration of suspended particles, the more serious the impact on the human body. Many people may think that the air is just a little dirtier, and it will not be good to take a few puffs, but from the research, we can find that the change in the concentration of suspended particulates is directly related to the probability of death, and when the number of suspended particulates in a certain place is extremely high, there is a chance to "kill people", as in the 1952 London smog incident (TheGreatSmog).

Known as the smog capital, London is the birthplace of the Industrial Revolution, and the massive burning of coal caused sulphur dioxide (sulfurdioxide) and suspended particulates to accumulate over the city, covering the entire city in smog. The incident occurred on December 5, 1952, due to the weather, the smoke in the city on that day was more difficult to disperse, because it was winter, the coal-fired heating of every household and the large amount of exhaust gas emitted by the factory chimney, gathered and fused with each other, turning the smoke into a thick and deadly yellow gas.

According to statistics, about 4,000 people died after inhaling the smoke, and the deadly yellow poisonous fog lasted for about five days before it completely dissipated, but the number of people who felt unwell or had other complications affected by the smoke may reach more than 25,000.