Update: 2019-08-25 16:33 Source: LUFTMY
PM2.5 refers to airborne particulate matter with an aerodynamic equivalent diameter of 2.5 microns or less, which can linger in the air for a long time and can have health effects if inhaled into the lungs. The higher the PM2.5 content in the air, the higher the concentration is, and the more serious the air pollution is.
(1) natural sources, including soil dust, plant pollen, spores, bacteria, etc.
(2) anthropogenic sources, including coal burning, gas, fuel oil, automobile exhaust emissions, second-hand smoke, dust and other dust.
The highest levels of fine particulate matter are found in north Africa and north, east and central China. The world health organization (WHO) considers PM2.5 less than 10 a safe level, while all of these areas in China are above 50 and close to 80, much higher than the Sahara desert.
Although PM2.5 has very little composition in the atmosphere, it has a serious impact on air quality.Compared with larger atmospheric particles, PM2.5 has a smaller particle size and is rich in a large number of toxic and harmful substances. Moreover, it stays in the atmosphere for a long time and has a long transportation distance, so it has a greater impact on human health and the quality of atmospheric environment.According to the relevant research, the smaller the particle size, the greater the harm to human health. Fine particles can float far away, so the influence range is large.
Fine particles are more harmful to human health, because the smaller the diameter, the deeper into the respiratory tract.Particles 10 microns in diameter are usually deposited in the upper respiratory tract, and particles less than 2 microns deep into the bronchioles and alveoli, so PM2.5 is also known as "lungable particles."When PM2.5 enters the alveoli, it directly affects the ventilation function of the lungs, making the body prone to hypoxia.
With the improvement of people's living standards, people pay more and more attention to air quality and have higher requirements on air quality. For example, more and more families choose to use air purifiers to purify indoor air for PM2.5 and other dust particles, and PM2.5 sensors are needed to detect PM2.5 concentration data in air purifiers.Luftmy laser PM2.5 dust sensor is a high-precision particle concentration sensor based on MIE scattering theory of laser.The PM2.5 dust laser sensor LD11 can embed various instruments or environmental improvement equipment related to the concentration of suspended particulate matter in the air, providing timely and accurate concentration data.