Dust only produces coarse particles and does not produce PM2.5, is it?

Dust only produces coarse particles and does not produce PM2.5, is it? Our deviation from dust awareness may stem from two points: First, it is believed that dust is almost composed of crustal material; second, the power to generate dust is mechanical, and mechanical action is difficult to pulverize particles below 1 micron. Therefore, it is logical to conclude that a large particle size dust generated by mechanical force does not or substantially does not produce PM2.5. However, in fact, although the mechanical force is difficult, it is still possible to pulverize the particles to less than 1 micron, and at least a certain amount of particles having a particle diameter of 1 to 2.5 micrometers can be produced. In addition, PM2.5 samples collected in the urban atmosphere of Beijing and other cities include a certain amount of crustal material mainly generated by dust, which also proves that dust is an important source of PM2.5.
According to Dongguan environmental protection professionals, dust includes not only primary dust but also a large amount of secondary dust. Urban dust emissions are not only the crustal material, but also the footprint of many human activities. The particulate matter produced by non-mechanical action such as motor vehicle exhaust, volatile organic compounds, etc. are fine particles, and these fine particles settle to the underlying surface of roads, bare ground, squares, roofs, farmland, etc., and then pass through the secondary dusting process again. Was sent into the atmosphere. Fine particles generated by motor vehicle exhaust, volatile organic compounds, etc., settle to the ground and then enter the atmosphere through secondary dust. It is one of the important components of PM2.5 generated by dust, and it is also one of the reasons for the complexity of dust. If PM2.5 discharged directly from the exhaust pipe of a motor vehicle is completely attributed to the motor vehicle itself, then PM2.5 (secondary dust) that has settled into the atmosphere after sinking to the surface should be attributed more to dust. . If the dust problem is solved well, and these fine particles are no longer raised after settlement, the air quality of the city is bound to change. Of course, the crustal material is the main component of dust, and it is also the main material that dust affects atmospheric PM2.5. The first thing we should pay attention to is the crustal material emitted by dust, but the secondary dust is in the process of knowing and controlling PM2.5. It should not be ignored.
Dust control measures can be divided into two forms. One is to prevent measures, and the other is to mitigate measures. Preventive measures refer to controlling the generation of dust from the front end by changing the mode of life or production activities, preventing the way of generating dust or changing the mode of dust emission. For example, paving non-paved roads, bare ground hardening or greening, dusting operation process into the room (discharged into organized dust through the exhaust pipe), no-tillage and stubble after crop harvesting. The mitigation measures are to take engineering measures to reduce the emission intensity of dust. Measures such as covering, setting up wind barriers, watering, rinsing, and applying chemical dust suppressants to reduce wind speed or increase surface cohesion. In a sense, prevention measures are more effective measures and require greater attention than mitigation measures.
From a purely technical point of view, the technical difficulty of most dust control measures is not very large. Similarly, in many cases, the economic cost of controlling dust is not high compared to the level of economic activity that generates dust. Taking active actions and adopting cost-effective and monitoring measures according to specific conditions is the key to dust control.
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