The harm of PM2.5 to human body
PM of PM2.5, particulate matter is an abbreviation of an English word, translated as fine particulate matter.
2.5 of PM2.5 is 2.5 microns, 1000 microns u003d 1 mm, 2.5 microns is equivalent to 1/20 of the diameter of a hair. Therefore, fine particles with a diameter of 2.5 microns are invisible to the naked eye. Excessive inhalation of PM2.5 is very harmful to the human body:
1. Causes airway obstruction or inflammation
Research shows that 75% of particulate matter below 2.5 microns is deposited in the alveoli.
2. Pathogenic microorganisms, polycyclic aromatic hydrocarbons, oil fumes, etc. hitchhiking into the body to cause cancer
In addition to doing bad things on their own, fine particulate matter is like a car that can freely enter the respiratory system The trolley, and other pathogenic substances such as bacteria and viruses, hitch a ride and come to the depths of the respiratory system, causing infection.
An epidemiological survey found that polycyclic aromatic hydrocarbons in urban atmospheric particulates were associated with the morbidity and mortality of lung cancer in residents. In the process of PAHs entering the human body, fine particles play the role of a hitchhiker. Most PAHs in the atmosphere are adsorbed on the surface of particles, especially particles with a particle size of less than 5 mm, and polycyclic aromatic hydrocarbons on large particles. Aromatics are rare. That said, the more fine particles there are in the air, the more exposure we have to carcinogens called PAHs.
3. Affect fetal development and cause defects
There are also some findings that make people even more worrying. Some reports in recent years have shown that human reproductive capacity is significantly declining, and environmental pollution is considered to be the culprit. A survey from northern Bohemia, which studied pregnant women exposed to high levels of PM2.5, found that high levels of fine particulate pollution may affect embryonic development.
More studies have found that atmospheric particulate matter concentrations are associated with increased perinatal and neonatal mortality, low birth weight, intrauterine growth retardation (IURG), and birth defects.
4. PM2.5 particles can enter blood vessels through qi-blood exchange.
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