The smog weather in a field made consumers realize the harm of PM2.5. In fact, PM2.5 is only a van concept. PM2.5 in the consumer’s mouth, 95% of which is PM0.3, one is more than PM2. .5 small and nearly 600 times the “killer” can enter the lung particles!
Therefore, to be precise, PM2.5 can be subdivided into PM0.3 (below 0.3 microns) and narrowly defined PM2.5 (0.3 to 2.5 microns).
I believe that many consumers are familiar with PM2.5, but since China has not carried out PM0.3 monitoring on a large scale, many consumers still have a blank concept of PM0.3, which has led to many air purification products on the market. Remove the effect of PM0.3.
PM2.5, also known as fine particulate matter, refers to particulate matter with an aerodynamic equivalent diameter of 2.5 microns or less in ambient air. The higher the concentration in the air, the more serious the air pollution. How serious is its health and impact on human health? I believe many people have already experienced it personally. What is the focus on PM0.3?
What is PM0.3
PM0.3 is a general term for solid particles or droplets with a diameter of less than or equal to 0.3 microns. It is also known as a particulate matter that can be incorporated into the lungs. The particle size is smaller, only 1/200 of the hair. It is rich in toxic and harmful substances and has a long residence time in the atmosphere. PM0.3 can drift over 1000 km, which has a greater impact on human health and the quality of the atmospheric environment.
PM0.3 is not perforated?
Compared with PM2.5, which can only enter the lungs by breathing and block the alveoli, PM0.3 can be described as “pervasive” in the propagation channel. Because the particle size is only 1/200 of the hair silk, PM0.3 can not only reach the deepest part of the lungs through breathing, but also can swing into the alveoli and enter the blood tissue of the human body, and can not be removed permanently. Damage and prevention are far more difficult. We know PM2.5.
Due to the wide range of sources of PM0.3, people can hardly avoid contact with them in daily life. Studies have shown that more than 90% of PM0.3 comes from waste gas from power plants, factories and automobiles, and contains heavy metals such as mercury, cadmium, and lead. And stay longer in the air.
Indoors, PM0.3 mainly comes from decoration, home paints, and adhesives. After the PM0.3 in the air enters the human blood circulation, it will cause health hazards to many human organs such as cardiovascular and brain. Heavy metal PM0.3 will also damage the human respiratory system, immune system, and circulatory system. PM0.3 containing formaldehyde, benzene, and other substances is the root cause of leukemia, nasal cancer, and colon cancer.
PM0.3 is the most penetrating
For indoor air treatment, consumers generally accept air purifier products. The purification is mainly through increasing indoor air circulation and filter purification. The most efficient one is the HEPA filter, also called high-efficiency particles. There are four main filtering mechanisms for HEPA filters:
(1) The first type is the interception mechanism, and the removal of large particles is very obvious;
(2) The second mechanism is the influence of gravity. The particles with small volume and high density will reduce the movement speed when passing through the HEPA filter, and naturally settle on the HEPA filter;
(3) The third mechanism is the influence of airflow. Due to the uneven weaving of the HEPA filter, a large number of air vortices are formed, and the effects of the cyclone received by the cyclone are adsorbed on the HEPA to achieve the filtering purpose.
(4) The fourth filtering mechanism is that the ultrafine particles impinge on the HEPA filter fiber under the action of Brownian motion, and are filtered by electrostatic adsorption under the influence of van der Waals force.
Compared with smaller volume particles such as P0.1, PM0.3 is not easily affected by a cyclone or van der Waals force, and the capture mechanism of large particles also has little effect on PM0.3. Therefore, PM0.3 is also the most penetrating. The force particles measure the pros and cons of the HEPA filter, mainly depending on the purification efficiency of PM0.3.
to sum up:
For PM0.3 such fine particles, any mask is difficult to resist, the only way is to reduce pollution, and the purification products that are generally accepted by consumers in the market also take PM2.5 removal rate as one of the standards of cleanliness, but The study of PM0.3 can be said to be a blank.
The PM0.3 particles in the air can be removed from the air mainly through the HEPA filter. However, the industry has not yet made standards for the purification of PM0.3, which has also led to the uneven quality of HEPA filters. When consumers purchase air purifiers, In addition to avoiding the so-called “black technology” of the manufacturer, it is also necessary to pay attention to whether it is equipped with HEPA filter and the removal rate. Of course, the filter should be replaced and cleaned regularly to avoid secondary pollution.
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