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This standard is formulated with a view to protecting human health as well as preventing and controlling the indoor air pollution.
Annex A, Annex B, Annex C and Annex D of this standard are normative.
This standard is firstly issued.
This standard was drafted by the "Indoor Air Quality Standard" Joint Drafting Team of the Ministry of Health and the State Environmental Protection Administration.
Chief Drafting Organizations: Chinese Center for Disease Control and Prevention (CDC), Institute for Environmental Health and Related Product Safety, Environmental Standard Institute of Chinese Research Academy of Environmental Science, CDC Radiation Protection Safety Institute, College of Urban and Environmental Sciences of Peking University, College of Environmental Science and Engineering of Nankai University, Beijing Municipal Institute of Labor Protection, School of Architecture of Tsinghua University, Research Center for Eco-environmental Science of Chinese Academy of Sciences, Environmental Engineering Institute of China Building Materials Academy.
This standard was approved by the General Administration of Quality Supervision, Inspection and Quarantine, the Ministry of Health and the State Environmental Protection Administration on November 19, 2002.
This standard was proposed by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China.
The State Environmental Protection Administration and the Ministry of Health are responsible for the explanation of this standard.
1 Scope
This standard specifies the indoor air quality parameters and inspection methods.
This standard is applicable to the residential buildings and office buildings, and may apply to other indoor environment by reference.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB/T 9801 Air quality-Determination of carbon monoxide-Non-dispersive infrared spectrometry
GB/T 11737 Standard method for examination of benzene toluene and xylene in air of residential areas-Gas chromatography
GB/T 12372 Standard method for examination of nitrogen dioxide in air of residential areas-Modified Saltzman method
GB/T 14668 Air quality - Determination of ammonia - Nesslers reagent colorimetric method
GB/T 14669 Air quality - Determination of ammonia - Ion selective electrode method
GB/T 14582 Standard methods for radon measurement in environmental air
GB 14677 Air quality-Determination of toluene, dimethyl benzene and styrene-Gas chromatography
GB/T 14679 Air quality-Determination of ammonia-Sodium salicylate-sodium hypochlorite spectrophotometric method
GB/T 15262 Ambient air-Determination of sulfur dioxide-Formaldehyde absorbing-pararosaniline spectrophotometry
GB/T 15435 Ambient air-Determination of nitrogen dioxide-Saltzman method
GB/T 15437 Ambient air-Determination of ozone-Indigo disulphonate spectrophotometry
GB/T 15438 Ambient air-Determination of ozone-Ultraviolet photometric method
GB/T 15439 Air quality-Determination of benz[a]pyrene in ambient air-High performance liquid chromatography
GB/T 15516 Air quality-Determination of formaldehyde-Acetylacetone spectrophotometric method
GB/T 16128 Standard method for hygienic examination of sulfur dioxide in air of residential areas-Formaldehyde solution sampling-pararosaniline hydrochloride spectrophotometric method
GB/T 16129 Standard method for hygienic examination of formaldehyde in air of residential areas-Spectrophotometric method
GB/T 16147 Scintillation flask method for measuring radon concentration in the air
GB/T 17095 Hygienic standard for inhalable particulate matter in indoor air
GB/T 18204.13 Methods for determination of air temperature in public places
GB/T 18204.14 Methods for determination of air humidity in public places
GB/T 18204.15 Methods for determination of wind speed in public places
GB/T 18204.18 Methods for determination of air change flow of indoor air in public places
GB/T 18204.23 Methods for determination of carbon monoxide in air of public places
GB/T 18204.24 Methods for determination of carbon dioxide in air of public places
GB/T 18204.25 Methods for determination of ammonia in air of public places
GB/T 18204.26 Methods for determination of formaldehyde in air of public places
GB/T 18204.27 Methods of examination of ozone in air of public places
3 Terms and Definitions
3.1 Indoor air quality parameter
It refers to the physical, chemical, biological and radioactive parameters related to the human health in the indoor air.
3.2 PM 10 (particulates with diameter 10μm or less)
It refers to the particulates that can suspend in the air and the aerodynamics equivalent diameter≤10μm.
3.3 TVOC (total volatile organic compound)
It refers to the volatile organic compound sampled by Tenax GC or Tenax TA, analyzed by nonpolar chromatographic column (polarity index is less than 10), with retention time between normal hexane and normal cetane.
3.4 Normal state
It refers to the dry matter state that the temperature is 273K and the pressure is 101.325kPa.
4 Indoor Air Quality Standard
4.1 Indoor air shall be nontoxic, harmless and free from abnormal odor.
4.2 Indoor air quality standard is detailed in Table 1.
Table 1 Indoor air quality standard
Item Parameter type Parameter Unit Standard value Remark
1 Physical property Temperature ℃ 22~28 Summer air-conditioning
16~24 Winter heating
2
Relative humidity % 40~80 Summer air-conditioning
30~60 Winter heating
3
Air velocity m/s 0.3 Summer air-conditioning
0.2 Winter heating
4
Fresh air volume m3/(h·person) 30a
5 Chemical property Sulfur dioxide SO2 mg/m3 0.50 1h, average value
6
Nitrogen dioxide NO2 mg/m3 0.24 1h, average value
7
Carbon monoxide CO mg/m3 10 1h, average value
8
Carbon dioxide CO2 % 0.10 Daily average value
9
Ammonia NH3 mg/m3 0.20 1h, average value
IO
Ozone O3 mg/m3 0.16 1h, average value
11
Formaldehyde HCHO mg/m3 0.10 1h, average value
12
Benzene C5H5 mg/m3 0.11 1h, average value
13
Methylbenzene C7H8 mg/m3 0.20 1h, average value
14
Dimethylbenzene C8H10 mg/m3 0.20 1h, average value
15
Benzo (a) pyrene B(a)P ng/m3 1.0 Daily average value
16
Particulates with diameter 10μm or less
PM10 mg/m3 0.15 Daily average value
17
Total volatile organic compound
TVOC mg/m3 0.60 8h, average value
18 Biological property Aerobic bacterial count cfu/m3 2500 According to the instruments b
19 Radioactive property Radon 222Rn Bq/m3 400 Annual average value(Action level c)
a Fresh air volume shall not be less than the standard value; other parameters (except the temperature and relative humidity) shall not be greater than the standard values.
b See Annex D.
c Action level refers to the level up to which intervention actions are suggested to be taken to reduce the indoor radon concentration.
Contents
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Indoor Air Quality Standard
5 Indoor Air Quality Inspection
Annex A (Normative) Indoor Air Sampling Technique
Annex B (Normative) Inspection Method of Benzene in the Indoor Air (Capillary Gas Chromatography)
Annex C (Normative) Inspection Method of Total Volatile Organic Compound (TVOC) in the Indoor Air (Thermal Desorption/Capillary Gas Chromatography)
Annex D (Normative) Inspection Method of Aerobic Bacterial Count in the Indoor Air
