Update: 2019-12-23 16:45 Source: LUFTMY
What is PM2.5 today? It's about air quality, and more and more people are paying attention to it. PM2.5 - a professional term consisting of English and numbers. What exactly is PM2.5? How to monitor PM2.5? What is the impact on human health?
PM2.5 refers to the fine particles with diameter less than or equal to 2.5 microns in the atmosphere, also known as the particles that can enter the lung. PM2.5 particle size is small, its diameter is less than 1 / 20 of human hair thickness.PM2.5 is 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 environment quality. Although PM2.5 is only a small component of the earth's atmospheric components, it has a significant impact on air quality and visibility.
In aerodynamics, the dust whose diameter is less than 10 μ M can enter the alveolar area is usually called respiratory dust. Most of the dust particles with a diameter of more than 10 μ m are deposited by impact, and most of them are deposited in the nasopharynx when inhaled, while the dust particles with a diameter of less than 10 μ M can enter the deep part of the respiratory tract. However, most of the dust deposited in the alveoli is below 5 μ M.
PM10 refers to particles with an equivalent aerodynamic diameter of less than or equal to 10 μ m in the ambient air. PM2.5 fine particles have small diameter, long suspension time in the atmosphere, long spread distance, and usually contain a large number of toxic and harmful substances, so it has a greater impact on human health. PM2.5 can enter the lungs and blood, if there are bacteria, it will have a great harm to human body, including our respiratory system, cardiovascular system, and even reproductive system.
The standard of PM2.5 was put forward by the United States in 1997. It is mainly for the purpose of more effective monitoring of fine particles harmful to human body that appeared with the development of industrialization and were ignored in the old standard. The fine particle index has become an important index to measure and control the degree of air pollution. By the end of 2010, in addition to some countries of the United States and the European Union including fine particles in national standards and mandatory restrictions, most countries in the world have not carried out the monitoring of fine particles, most commonly PM10.
The PM2.5 sensor dust concentration detection sensor LD13 can continuously collect and calculate the number of suspended particles with different particle sizes in the air per unit volume, that is, the particle concentration distribution, and then convert it into mass concentration, and output it in the form of a universal digital interface.LUFTMY LD13 dust concentration detection sensor has a small volume of high precision, strong anti-interference ability, low power long life, zero error alarm rate response time is short features, such as the PM2.5 self-cleaning sensors can be embedded in a variety of related to the concentration of suspended particles in the air such as air micro particle counter, particulate cleanliness of detector, high precision instrument or environment, such as dust particle counter to improve equipment, to provide timely and accurate concentration data.