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| What is the difference between GB/T18883 and GB50325 in indoor air testing? | |
| 2021-05-31 | |
| The national standard "Indoor Air Quality Standard" GB/T18883-2002 will be formally implemented on March 1 this year. In the recent period, many media have carried out relevant reports on this. As an indoor environment testing agency, Environmental Testing Technology Research Center compares this standard with the national standard "Code for Indoor Environmental Pollution Control of Civil Construction Engineering" GB50325-2001, which was implemented on January 1, 2002, to clarify some fallacies. . (1) The nature of the standard is different The national standard "Indoor Air Quality Standard" GB/T18883-2002 is a recommended standard and is implemented voluntarily. The national standard "Code for Indoor Environmental Pollution Control of Civil Construction Engineering" GB50325-2001 is a mandatory standard and must be implemented regardless of whether it is willing or not, otherwise it will be punished by the relevant government departments. This is the fundamental difference between the above two standards. At the same time, the above two standards exist in parallel and are implemented separately, and there is no question of who replaces whom. (2) The scope of application of the standard is different The national standard "Indoor Air Quality Standard" GB/T18883-2002 stipulates indoor air quality parameters, which is suitable for indoor environmental quality evaluation in residential and office buildings. The national standard "Code for Indoor Environmental Pollution Control of Civil Construction Engineering" GB50325-2001 is applicable to the quality acceptance of civil construction projects (including civil construction and decoration). The indoor environmental pollution involved in this standard refers to indoor environmental pollution caused by building materials and decoration materials. The indoor environmental pollution problems that appear in the living environment and working environment after the project is delivered to use, such as indoor environmental pollution caused by burning, cooking, smoking, indoor facilities, outdoor air, etc., should refer to the national standard "Indoor Air Quality Standard" GB /T18883-2002 implementation. (3) The purpose of standard formulation is different The national standard "Indoor Air Quality Standard" GB/T18883-2002 was formulated to protect the health of people living and working in the indoor environment, and to develop objective evaluation indicators for indoor air to meet the requirements for evaluating indoor air quality. The national standard "Code for Indoor Environmental Pollution Control of Civil Construction Engineering" GB50325-2001 was formulated to protect the health of people living and working in the indoor environment, to formulate indicators of harmful substances released by buildings, and to only verify the impact of the building itself on the indoor environment. influences. Therefore, the impact of outdoor air and indoor facilities on indoor air needs to be deducted during the implementation of this standard. (4) The indicators specified by the standard are different The national standard "Indoor Air Quality Standard" GB/T18883-2002 stipulates a total of 19 parameter indexes, including physical indexes, chemical indexes, biological indexes and radioactive indexes. The national standard "Code for Indoor Environmental Pollution Control of Civil Construction Engineering" GB50325-2001 stipulates a total of 5 parameter indexes, including only chemical indexes and radioactive indexes. This standard divides civil construction projects into Type I and Type II. (5) The standard value specified by the standard is different The parameters specified in the above two standards include: formaldehyde, ammonia, benzene, total volatile organic compounds, and radon. The standard value of formaldehyde specified in the national standard "Indoor Air Quality Standard" GB/T18883-2002 is 0.10mg/m3 The standard value of ammonia is 0.20mg/m3; the standard value of benzene is 0.11mg/m3; the standard value of total volatile organic compounds is 0.60mg/m3; the standard value of radon is 400Bq/m3. The national standard "Code for Indoor Environmental Pollution Control of Civil Construction Engineering" GB50325-2001 stipulates that the standard value of formaldehyde is 0.08mg/m3 for class I, 0.12mg/m3 for class II; the standard value for ammonia is 0.20mg/m3 for class I and 0.50 for class II mg/m3; the standard value of benzene is 0.09mg/m3 for class I and 0.09mg/m3 for class II; the standard value of total volatile organic compounds is 0.50mg/m3 for class I and 0.60mg/m3 for class II; the standard value for radon is 200Bq for class I /m3, 400Bq/m3 for Class II. (6) Testing methods specified by the standard The distribution principle stipulated in the national standard "Indoor Air Quality Standard" GB/T18883-2002 is to set up 1-3 points for rooms smaller than 50m2, 3-5 points for rooms smaller than 100m2, and at least 5 points for rooms larger than 100m2 . The national standard "Code for Indoor Environmental Pollution Control of Civil Construction Engineering" GB50325-2001 stipulates that the distribution principle is 1 point for rooms smaller than 50m2, 2 points for rooms smaller than 100m2, and 3-5 points for rooms larger than 100m2. The sampling time is specified in the national standard "Indoor Air Quality Standard" GB/T18883-2002, while the national standard "Code for Indoor Environmental Pollution Control of Civil Construction Engineering" GB50325-2001 does not. The national standard "Code for Indoor Environmental Pollution Control of Civil Construction Engineering" GB50325-2001 stipulates that the outdoor air background concentration value should be measured, while the national standard "Indoor Air Quality Standard" GB/T18883-2002 does not provide it. The testing methods specified in the national standard "Indoor Air Quality Standard" GB/T18883-2002 do not include on-site testing equipment methods, that is, on-site testing equipment cannot be used for testing. The national standard "Code for Indoor Environmental Pollution Control of Civil Construction Engineering" GB50325-2001 stipulates that on-site testing instruments can be used to detect formaldehyde. (7) Different testing institutions The national standard "Indoor Air Quality Standard" GB/T18883-2002 is a recommended standard. As long as it is a qualified testing organization with the parameter indicators specified in the standard, the test can be carried out. The national standard "Code for Indoor Environmental Pollution Control of Civil Construction Engineering" GB50325-2001 is a compulsory standard. It must be tested by a testing agency recognized by the executive body. Other testing agencies that have not been approved cannot perform testing. |
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