Indoor air quality standard

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[Abstract]:

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

They are: GB/T18883-2002 GB50325-2001

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

They are: GB/T18883-2002 GB50325-2001

National Standard for Indoor Environment 《GB50325-2001》

Contaminant name	One type of construction	Second type construction project	Standard
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: One type of building: residential, hospital, elderly apartment, kindergarten, school classroom, etc.

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

National standard for indoor environmentGB/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 mean
*Remarks: Action level means recommending action to reduce radon concentration.**

Indoor air testing conditions