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Table 12 Indoor air quality standard (GB/T 18883-2002) [63]

From: Indoor Air Pollution and Its Control in China

Parameter category Parameter Unit Standard value Note
Physical Temperature °C 22–28 With air-conditioning (summer)
16–24 With heating (winter)
Relative humidity % 40–80 With air-conditioning (summer)
30–60 With heating (winter)
Air velocity m/s 0.3 With air-conditioning (summer)
0.2 With heating (winter)
Amount of fresh air m3/(h · person) 30a  
Chemical Sulfur dioxide (SO2) mg/m3 0.50 1-h average
Nitrogen dioxide (NO2) mg/m3 0.24 1-h average
Carbon monoxide (CO) mg/m3 10 1-h average
Carbon dioxide (CO2) % 0.10 24-h average
Ammonia (NH3) mg/m3 0.20 1-h average
Ozone (O3) mg/m3 0.16 1-h average
Formaldehyde (HCHO) mg/m3 0.10 1-h average
Benzene (C6H6) mg/m3 0.11 1-h average
Toluene (C7H8) mg/m3 0.20 1-h average
Xylenes (C8H10) mg/m3 0.20 1-h average
Benzo(a)pyrene (B(a)P) ng/m3 1.0 24-h average
Inhalable particulate matter (PM10) mg/m3 0.15 24-h average
Total volatile organic compounds (TVOC) mg/m3 0.60 8-h average
Biological Bacteria total cfu/m3 2,500 Depending on instrument
Radioactive Radon (Rn) Bq/m3 400 Annual average (action levelb)
  1. aRequirement for the amount of fresh air: ≥ standard value; requirements for other parameters except temperature and relative humidity: ≤ standard value
  2. bRecommended to introduce interventions to reduce the indoor concentration of radon when the standard value is reached