PM unit is a unit of measurement that stands for the concentration of particulate matter and is usually used to describe the amount of particulate matter in the air.The full name of PM is Particulate Matter, which can be categorized into different levels such as PM10 and PM5, etc. PM10 denotes particulate matter with a diameter of less than 10 micrometers, whereas PM5 denotes particulate matter with a diameter of less than 5 micrometers. These particles can come from different sources such as vehicle emissions, industrial production, natural disasters etc.
PM units are widely used in the field of environmental monitoring to measure the level of pollutants in the air. These units can also be used in other fields such as healthcare and engineering. In healthcare, PM units can be used to measure the severity of a patient's lung lesions and respiratory disease. In engineering, PM units can be used to determine the particle filtration rate of buildings and equipment to ensure air quality compliance.
The Difference Between PM10 and PM5
Although PM10 and PM5 both represent airborne particles, there are subtle differences between them. PM10 are particles smaller than 10 microns in diameter, which can cause respiratory infections, but the relatively large particles are more likely to be filtered out by bacteria and hair in the nose and mouth. PM5 are particles less than 5 microns in diameter, which are smaller and can enter the lungs and cause serious respiratory and cardiovascular diseases. As a result, engineering design and environmental monitoring have different limits for these two types of particulate levels.