Why is the official PM2.5 data different from the folk measurement results?

1. At present, most environmental monitoring centers in China mainly measure atmospheric particulate matter (pm2.5) by weighing method. The weighing method has an obvious disadvantage: time lag. From the beginning of the measurement to the conclusion, it takes several hours or even more than ten hours at the earliest. This data is the average value calculated by 24-hour continuous monitoring, not the real-time value. The value of the portable PM2.5 monitor is real-time, so the two values will not be consistent.

2. Back indoors, no matter at home or in the office, the reference value of official data is not great. Because there is still a big gap between indoor and outdoor concentrations of gases such as PM2.5, it is definitely not appropriate for you to put an official instrument at home, with a unit price of about 200,000. Therefore, for indoors, the civil air quality detector is the only reliable choice. It is not only economical, but also practical. Although the scattering principle is not more accurate than the official weighing data, there is still a certain gap. But it can meet the real-time monitoring of indoor air data and help us judge the use effect of home air purifier or new fan. At present, the better Gu Bei PM2.5 monitor on the market adopts 32-bit industrial-grade CPU processor, high-precision front-end amplifier circuit and ultra-low noise reduction, which ensures the data sensitivity, no drift and stable performance of the instrument.