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"The outdoor PM2.
5 concentration is 530μg/m3, while the home is only 15μg/m3.
The air purifier works very well
.
" Ms.
In the winter of 2016, the smog hit many northern cities in China, including Beijing, and various household PM2.
5 meters that are easy to use and affordable have also become the object of many consumers' pursuit
.
So, the accuracy of home PM2.
The measuring instrument enters the homes of ordinary people
Enter "PM2.
5 measuring instrument" on Taobao.
com, and you can search for more than 100 items of inspectors, Agres, Hanwang and other brands, with prices ranging from more than 90 yuan to thousands of yuan
.
On the web pages of each product, various promotional slogans such as "ultra-high-precision professional instrument" and "real-time accurate detection" are very eye-catching
Professional measuring instrument does not use light scattering method
Qingdao Zhongrui Intelligent Instrument Co.
, Ltd.
is a high-tech enterprise specializing in the development and production of high-end environmental monitoring instruments and safety testing instruments
.
The professional PM2.
The "Ambient Air Quality Standards" that came into effect on January 1, 2016 clearly stipulate that the manual analysis method for PM2.
5 measurement is the gravimetric method, and the automatic analysis method is the micro-oscillation balance method and the β-ray method, and there is no light scattering method.
That is to say, for professional environmental protection and meteorological measurement, the instruments manufactured by the light scattering method are not recognized
.
Zhang Wenge, a senior engineer at the Institute of Nano New Materials of the Chinese Academy of Metrology, explained that for PM2.
5 measurement, different measurement methods and different measurement environments will affect the accuracy of the measurement
.
The household PM2.
Professional calibration specifications are expected to be released this year
As early as a few years ago, the Chinese Academy of Metrology began to conduct research on PM2.
5 measurement traceability and measurement standard devices
.
Because in order to obtain accurate and reliable PM2.
"We have completed the final
review of the " National Calibration Specification for PM2.
5 Mass Concentration Measuring Instruments" and have been submitted for approval.
However, Zhang Wenge explained that their research is for the professional measuring instruments of the environmental protection and meteorological departments, and the household measuring instruments sold on the Internet are not within the scope of their research
