What is Airborne Particulate Matter

Airborne particulate matter is a general term for solid and liquid particulate matter in the air. According to its particle size, it can be divided into coarse dispersion system (particle size >10μm) and colloidal dispersion system (0.001~10μm). Among them, the aerodynamic equivalent particle size is less than 10μm for inhalable particulate matter (PMl0), due to the small particle size, it is easy to directly enter the respiratory tract and lungs, endangering human health. Particulate matter with a diameter of less than 2.5 μm is fine particulate matter (PM2.5), and most harmful elements and compounds are enriched in fine particulate matter, such as sulfate, nitrate, ammonium salt, carbon-containing particles, metal particles, minerals, etc. It is the main component of fine particulate matter. The smaller the particle size of fine particles, the greater their retention time in the atmosphere and the ratio of their absorption by the human body, and the greater the impact on human health.

Low Noise Car Air Purifier
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Then, how do particulate matter in the air, especially inhalable particulate matter and fine particulate matter enter the human body and cause harm to human health?

Generally speaking, particulate matter in the air can enter the human body through the respiratory tract, digestive tract, skin, etc. Among them, respiratory inhalation is one of the most important and most harmful ways. The smaller the particle size, the greater the harm to the human body. Particles with a particle size of more than 10 microns can be absorbed by the nose hair, and can also be excreted from the human body through coughing, while the inhalable particles with a particle size of less than 10 microns can be deposited in the lungs with human breathing. , can even enter the alveoli and blood. High-density particles with a particle size of 0.5-2 μm are most easily inhaled and settle in the alveolar area. An expert analyzed lung anatomical specimens from 10 Vancouver residents with electron microscopy and found that 96% of the particles deposited in the lung parenchyma were PM2.5, suggesting that the lungs have high selective retention of particles in this size range. After PM2.5 is deposited in the alveolar area, it can directly stimulate the lung mucosal, cause inflammatory reaction as a foreign body or cause allergic reaction as an allergen, etc., causing alveolar and mucosal damage, bronchial and lung tissue inflammation, chronic fibrosis, aggravating Asthma, and even lead to pulmonary heart disease. In addition, the soluble toxic substances adsorbed on the surface of the particles can enter the blood and cause damage to the lung tissue, the heart and even the organs of the whole body.

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