Indoor Air Quality Standard

Release Time：

2018-10-11

There are two indoor air quality standards in China: one from the Ministry of Health and one from the Ministry of Construction. These are: GB/T18883-2002 and GB50325-2001. National Standard for Indoor Environment 《GB50325-2001》 Pollutant Name Class 1 Construction Projects Class 2 Construction Projects Standard Number Formaldehyde ≤0.08mg/m3 ≤0.12mg/m∧3 GB50325-2001 Benzene ≤0.09mg/m3 ≤0.09mg/m∧3 GB50325-2001 Ammonia ≤0.20mg/m3 ≤0.50mg/m∧3 GB503

There are two indoor air quality standards in China: one from the Ministry of Health and one from the Ministry of Construction.

These are: GB/T18883-2002 and GB50325-2001

National standard for indoor environment GB50325-2001

Pollutant Name	Class I building projects	Class II building projects	Standard Number
Formaldehyde	≤ 0.08mg/m3	≤ 0.12mg/m∧3	GB50325-2001
Benzene	≤ 0.09mg/m3	≤ 0.09mg/m∧3	GB50325-2001
Ammonia	≤ 0.20mg/m3	≤ 0.50mg/m∧3	GB50325-2001
Radon	≤ 200Bq/m3	≤ 400Bq/m∧3	GB50325-2001
TVOC	≤ 0.5mg/m3	≤ 0.6mg/m∧3	GB50325-2001

Note: Class I buildings: residential buildings, hospitals, elderly apartments, kindergartens, school classrooms, etc.

Class II buildings: office buildings, commercial buildings, hotels, cultural and entertainment venues, bookstores, exhibition halls, libraries, stadiums, public transportation venues, restaurants, barbershops, etc.

National Indoor Environment Standard GB/T18883-2002

Serial Number	Parameter	Unit	Standard	Remarks:
1	Formaldehyde	mg/m∧3	0.10	1-hour average
2	Ammonia	mg/m∧3	0.20	1-hour average
3	Benzene	mg/m∧3	0.11	1-hour average
4	Radon	Bq/m∧3	400	*Annual average (action level)**
5	Total Volatile Organic Compounds TVOC	mg/m∧3	0.60	8-hour average
*Note: Action level refers to the suggested action to reduce radon concentration.**