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The new version of "Indoor Air Quality Standards" is officially released!


Time:

2022-08-11

The new version of "Indoor Air Quality Standards" (GB/T 18883-2022) was approved and released by the State Administration for Market Regulation (National Standardization Administration), replacing GB/T 18883-2002 "Indoor Air Quality Standards", from February 1, 2023 effective from today.

The new version of "Indoor Air Quality Standards" (GB/T 18883-2022) was approved and released by the State Administration for Market Regulation (National Standardization Administration), replacing GB/T 18883-2002 "Indoor Air Quality Standards", from February 1, 2023 effective from today.

 

It has been nearly 20 years since the release of the 2002 version of the "Indoor Air Quality Standards". What aspects have been updated and revised in the new version in 2022?

 

◉ Terms and Definitions
 
  • Add four terms and definitions of "fine particulate matter", "1-hour average", "8-hour average" and "24-hour average";
  • Delete the term and definition of "Standard Status";
  • Revise three terms and definitions of "Indoor Air Quality Index", "Respirable Particulate Matter" and "Total Volatile Organic Compounds".


 

◉ Specific Parameter Changes
  • Three new indicators and requirements for trichloroethylene, tetrachloroethylene and fine particulate matter are added;
  • Adjust the requirements of 5 chemical indicators (nitrogen dioxide, carbon dioxide, formaldehyde, benzene, inhalable particulate matter), 1 biological indicator (total number of bacteria) and 1 radioactive indicator (radon). (Note: Although the carbon dioxide limit value has not been adjusted, it is required to be revised from "daily average" to "1-hour average")
  • "Air velocity" was revised to "wind speed"; "total number of colonies" was revised to "total bacteria"; "summer air conditioning" and "winter heating" in the remarks of temperature, relative humidity and wind speed were revised to "summer" and "winter"; deleted Total number of bacteria remarks (according to the instrument); "action level" in the radon remarks is revised to "reference level".

 

From the data, it can be seen intuitively that the safety standard values of formaldehyde, benzene, PM10, nitrogen dioxide, etc. have been greatly reduced, which is also in line with the trend of people paying more and more attention to air safety in recent years.

The main source of PM2.5 is smog (the main indoor sources are smoking, oil fumes, etc.), which can pass through the upper respiratory tract barrier without awareness, directly reach the alveoli, and enter the blood circulation.

The biological parameter was revised from "total number of colonies" to "total number of bacteria", and the standard value was also reduced from 2500cfu/m³ to 1500cfu/m³. After experiencing this epidemic, we have a deeper understanding of bacteria and viruses, and remind us to pay attention to these invisible and intangible pollutants, but widely exist in our breathing space.

 

◉ Measurement and Evaluation of Indoor Air Quality Indexes
  • Revised the technical guidelines for the detection of indoor air quality indicators, midpoint layout, sampling time and frequency, sampling instruments, sampling methods, sampling records, sample transportation and storage, 22 pollutant measurement methods and sources, quality assurance measures, concentration correction and other technologies Require. (Appendix A);
  • Added recommended sampling method parameters; added effective digital retention method of measurement results; added laboratory safety management (Appendix A);
  • New appendixes on the determination methods of five indicators including formaldehyde, benzo[a]pyrene, inhalable particulate matter, fine particulate matter, and radon (Appendix B, Appendix E, Appendix F, Appendix H);
  • Revise the appendixes on the determination methods of 5 indicators including benzene, toluene, xylene, total volatile organic compounds and total bacteria (Appendix C, Appendix D, Appendix G);

 

In addition, the new standard also provides new guidance methods for sampling method parameters and measurement methods. The parameters and indicators of indoor air pollution are becoming more and more refined, which provides a reference for judging whether the home and office space is safe enough, and also provides a practical and reliable standard basis for daily air control related work and safeguarding our physical and mental health.

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