Currently, the current situation of air pollution is an urgent problem not only in the two big cities, Hanoi and Ho Chi Minh, but also a national problem. The air pollution situation increases, the fine dust mask is at a high level. It is progressing more and more in the bad direction, particularly the ultra-fine dust mask PM2.5. According to experts recommend, cannot use conventional masks to combat this dust mask, but must use fine dust masks with filter efficiency of 90% or more.
What is PM2.5 fine dust mask? What are its origin and harm?
Dust mask is understood as a mixture of inorganic or organic particles that exist in liquid or solid form, and can be suspended in space. According to science, dust mask is symbolized as pm (short for Particulate Matter). So, what is pm 2.5 dust mask? What are the characteristics?
Concept of fine dust mask PM2.5?
According to the National Technical Regulation on Ambient Air Quality (QCVN05: 2013) of the Ministry of Natural Resources and Environment, PM2.5 dust mask is the total of suspended dust mask particles with a kinetic diameter of less than or equal to 2, 5 micrometres. These are very small dust mask particles. For easy visualization let’s compare the diameter of a hair, usually 50-70 micrometres, which means that the diameter of the dust mask PM2.5 is less than 1/30 times the diameter of the hair.
In essence, dust mask 2.5 is formed from natural substances, such as nitrogen, carbon, metal compounds
The cause of dust mask
In the air, PM2.5 dust mask often arises from many sources of different sources, for example from vehicle emissions, operations of industrial plants, construction activities, burning of straw in agriculture, household activities (particularly is cooking and heating with coal, firewood), from tobacco smoke …
For example, in Hanoi, the traffic density is increasing and in recent years the whole city is like a huge construction site, so PM2.5 dust mask pollution is getting more serious. According to statistics of the Hanoi Department of Construction 2019, there are over 1,000 large and small construction sites under construction each month and more than 10,000m2 of roads are excavated each month to implement technical infrastructure works. Vehicles carrying construction materials that are not securely covered and drop soil and sand on the road are also a source of dust mask. In addition, in the world, PM2.5 dust mask can also originate from volcanoes, dust mask storms, forest fires …
Therefore, the formation of ultra-toxic fine dust mask is completely unavoidable.
The harm of fine dust mask to humans
According to the World Health Organization (WHO), when we breathe, the nose can filter dust mask particles larger than 10 micrometres in diameter. For particles between 0.01 and 5 micrometers in size, they are trapped in the trachea and alveoli. PM2.5 fine dust mask (less than 2.5 micrometers in diameter) can penetrate the human body due to its microscopic size, causing more health effects than any other pollutant, even in low concentration.
Each day we breathe about 10,000 liters of air or more depending on age and physical activity. Therefore, PM2.5 fine dust mask can easily enter the human body through the respiratory system. From there, causing dangerous diseases, such as stroke, heart disease, difficulty breathing, cancer, runny nose …
Not only that, once the pm2.5 fine dust mask concentration in the air rises, they will make the atmosphere become fuzzy, dense and smoky, leading to a serious decrease in visibility while traveling on the road. Therefore, it is very necessary to equip a specialized dust mask mask with special filters to prevent fine dust mask from entering through the respiratory tract.
