The PM2.5 value is an air quality standard. China's PM2.5 concentration limits are set according to the most lenient transition period standards recommended by the World Health Organization; specifically, the annual average concentration limit is ≥35μg/m³, and the 24-hour average concentration limit is ≥75μg/m3. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 microns, also known as fine particulate matter or respirable particulate matter, which is equivalent to 1/20 the diameter of a human hair and can enter the lungs directly.

PM2.5 primarily comes from natural and anthropogenic sources. Although its content in the Earth's atmospheric components is small, it has an important impact on air quality and visibility. PM2.5 has a small particle size, large surface area, and high activity, making it easy to carry toxic and harmful substances (such as heavy metals, microorganisms, etc.). Furthermore, it stays in the atmosphere for a long time and is transported over long distances, thus significantly affecting human health and atmospheric environmental quality.

How to measure indoor PM2.5 concentration?

The Luftmy editor has learned that the PM2.5 data we usually see on TV or the internet is an average value for a region, while concentrations in many indoor spaces differ greatly from this. To measure indoor air quality, a portable PM2.5 detector can be used to conveniently detect the PM2.5 concentration in various rooms.

PM2.5 concentration detectors require the support of relevant theories and data from PM2.5 sensors. For instance, Luftmy's laser PM2.5 dust sensor LD12 is a high-precision particulate matter concentration sensor based on Laser Mie Scattering theory. it can continuously collect and calculate the number of suspended particles of different sizes in the air per unit volume (i.e., particle size distribution), which is then converted into mass concentration and output via a universal digital interface. This sensor can be embedded in various instruments or environment improvement equipment related to the concentration of suspended particles in the air to provide timely and accurate concentration data.