Concerned about the haze situationIt is often found that the main pollutants of haze will change, sometimes PM2.5, sometimes PM10, what is the difference between these two indicators?

Definition of 1. PM2.5 and PM10

PM2.5Aerodynamic equivalent diameter in ambient air less than or equal 2.5 Micron particles, also known as fine particles, can enter the lung particles. Its diameter is less than the thickness of a human hair.1/20It can be suspended in the air for a long time, and the higher its content (concentration) in the air, the more serious the air pollution. AlthoughPM2.5It is only a small component of the earth's atmospheric composition, but it has an important impact on air quality and visibility.PM2.5Small particle size, large specific surface area, strong activity, easy to attach toxic and harmful substances (for example, heavy metals, microorganisms, etc.), and the residence time in the atmosphere is long, and the transportation distance is far, so it has a greater impact on human health and atmospheric environmental quality.

PM10is the aerodynamic equivalent diameter less than or equal10Micron inhalable particles, refers to the floating in the air of solid and liquid particles in general.PM10It can enter the upper respiratory tract, but part of it can be excreted through sputum, etc., and it will also be blocked by the villi inside the nasal cavity.

As can be seen from the definition,PM2.5YesPM10One of a kind, they are inclusive relationships,PM2.5GeneralPM10of70%Left and right.

2.PM2.5andPM10the source

PM2.5The main source of production is dailyPower generationMost of the residues emitted from combustion in the process of industrial production and automobile exhaust emissions contain toxic substances such as heavy metals. Generally speaking,PM2.5Mainly from the combustion of fossil fuels, such as motor vehicle exhaust, coal, etc., in addition to some volatile organic compounds.

PM10Direct emissions from pollution sources, such as smokestacks and vehicles. Others are fine particles formed by the interaction of sulfur oxides, nitrogen oxides, volatile organic compounds and other compounds in the ambient air. Their chemical and physical composition varies greatly depending on the location, climate and season of the year.PM10Usually from vehicles running on unpaved asphalt and cement roads, the crushing and grinding process of materials, and dust raised by the wind.

3.PM2.5andPM10The hazards

The finer the particles, the greater the harm to the human body, the particle size of more10Micron particles can be blocked by nose hair, can also be discharged from the body by coughing, and the particle size is less10Micron inhalable particles can be deposited into the lungs with human breathing, and even into the alveoli and blood.

1、PM2.5The hazards

AlthoughPM2.5It is only a small component of the earth's atmospheric composition, but it has an important impact on air quality and visibility.PM2.5The particle size is small, rich in a large number of toxic and harmful substances, and has a long residence time in the atmosphere and a long transportation distance, so it has a greater impact on human health and atmospheric environmental quality. DuePM2.5The particle size is small, so it is easier to distribute evenly in the air, and it cannot be effectively isolated with ordinary masks and air purifiers.

PM2.5It will enter the alveoli through the respiratory tract and deposit in the lungs. At the same time, these particles have strong adsorption capacity and are a variety of pollutants.“Carrier”and“Catalyst”Sometimes it can become a collection of various pollutants and is the culprit of various diseases. They deposit on the alveoli, which will interfere with the gas exchange of the lungs, damage the alveoli and mucous membranes, cause chronic fibrosis of the lung tissue, lead to pulmonary heart disease, aggravate asthma, and cause a series of pathological changes such as chronic nasopharyngitis and chronic bronchitis. These particles can also enter the blood through the bronchi and alveoli. The harmful gases and heavy metals are dissolved in the blood, which can be life-threatening, especially harmful to children and the elderly.

2、PM10The hazards

PM10Formerly known as dust, refers to the long-term floating material in the atmosphere. Because it can float in the atmosphere for a long time, it is easy to bring pollutants to a long distance, which leads to the expansion of the pollution range. It can also provide a reaction bed for chemical reactions in the atmosphere. DuePM10The particle size is relatively large, soPM10is sedimentary, the concentration zui is high near the surface, and the concentration will decrease as the height increases.

PM10It can be directly inhaled into the respiratory tract, but part of it can be excreted through sputum, and it will also be blocked by the villi inside the nasal cavity, which is relatively small to human health. But...PM10The effect on visibility and temperature is very obvious.

4.PM2.5andPM10Detection

ShenzhenAgent of the United KingdomalphasenseofOPC-N3Sensors,is inOPC-N1、OPC-N2Based on the three generations of upgraded products, appearance size andOPC-N2With consistency, the range increases0.38-40um, the number of channels has the original16Increase24, while adding on-board temperature and humidity sensors, reducing standby mode power consumption, can detectPM1、PM2.5、PM10。

particle detectorOPC-N3advantages and application：

1Designed for large particles High2,000 µg/m3For heavily polluted environments

2, expanded40umRange helps identify pollen types

3、24channels, size morphology increases with more information to identify pollution sources