Beijing Zhonghuan environmental quality monitoring center professional third party environmental monitoring and testing agency
Indoor air detection in civil buildings

Current situation of indoor environmental pollution:
Indoor environmental pollution has become the main environmental pollution affecting human health. Decoration pollution is one of the main sources of indoor environmental pollution. In the modern society where hardcover prevails, decoration pollution is a problem that can not be ignored in family decoration. After the completion of decoration, indoor air detection and indoor environmental pollution control are also issues that owners need to consider.
A large number of foreign studies have shown that indoor air pollution can cause "pathogenic building syndrome" (BBS), including headache, eye, nose and throat discomfort, dry cough, dry skin itching, dizziness, nausea, difficulty in concentration and sensitivity to odor. The symptoms include cough, chest tightness, fever, chills and muscle pain.
In recent years, decoration pollution, which is harmful to health, has caused an increase in morbidity and mortality of the global population. The reason is that the building materials used in the newly-built and rebuilt buildings contain harmful substances, which seriously exceed the standard, and the construction quality is poor, which will cause air pollution in the indoor environment. In the environment of people's daily work and life, toxic air pollution can cause laryngitis, chest tightness, dizziness, vision decline, skin blisters and so on. It can cause serious diseases of the immune system and even cause cancer.
Therefore, it is necessary to carry out indoor environmental detection. Through scientific detection methods, owners can understand whether the environment after decoration meets the environmental protection requirements, so as to avoid the risk of environmental pollution, so that the owners can timely and effectively treat and rectify the unqualified air quality, so as to live and live in a good environment at ease.

Indoor air detection process
1. Telephone consultation or online consultation to determine the testing scheme, testing time and testing cost.
2. The room to be tested should be closed for 1 hour (GB 50325-2006 standard requirements, generally for building, decoration acceptance, etc.) or 12 hours (GB / t18883-2002 standard requirements, generally for home testing). When making an appointment for testing, the business personnel will call to confirm.
3. Professional testing personnel come to the site for sampling, answer the environmental problems raised by customers, introduce the testing process and precautions, and provide relevant supporting materials to customers.
4. Take the collected samples to the laboratory for analysis and test report within 3-5 working days. If the customer has special requirements, we can ask the sampling personnel, and we will arrange ahead of time.
5. For each test report, the customer has the right to ask the testing personnel to interpret, and put forward governance opinions and suggestions for reference when necessary.

Preparation before indoor air detection:
1. Code for civil engineering indoor pollution control (GB 50325-2006)
The first condition for air testing is to allow testing seven days after decoration. Seven days is to protect the interests of the construction workers, because the material itself will have a rapid release period after the decoration. After the rapid release period, it generally enters a relatively stable stage, and then begins to test.
There will be different detection conditions for each test item. For example, if the doors and windows are closed for more than one hour or more than twenty-four hours, there will be a sufficient ventilation before closing the doors and windows, which is to release all the accumulated pollution gas, otherwise a long-term accumulation will cause data increase.
When testing the concentration of formaldehyde, benzene, ammonia and total volatile organic compounds (TVOC) in the indoor environment of civil construction engineering, the civil construction engineering with central air conditioning should be carried out under the condition of normal operation of air conditioning; for civil construction engineering with natural ventilation, the detection should be carried out immediately after the outer doors and windows are closed for 1H; the radon concentration detection should be conducted after the outer doors and windows are closed for 24h.
According to the preparation work of GB / t18883-2002 indoor air quality standard, the doors and windows should be closed for 12 hours before sampling. During the period of closing the doors and windows, do not smoke or spray air freshener and other aromatic substances in the room. Smoking and aromatic articles may cause the concentration of indoor pollutants to overlap and increase the detection data.
Testing in other public places:
At present, China's hotels, cultural and entertainment places, public bathrooms, barber shops, beauty shops, swimming pools, museums, libraries, bookstores, shopping malls, hospitals, public transport waiting rooms, public transport vehicles (cars, cabins, engine rooms), hotels, restaurants and so on have health standards.
Standard for indoor test:
In order to effectively control indoor environmental pollution, the state has formulated a series of national standards. The first "indoor air quality standard" (GB / T 1883-2002) was promulgated on March 11, 2003. The standard specifies 19 items of indoor air detection. The standard is a national recommended title, the owners can choose the testing items according to their own needs and the actual situation of indoor environment. Shenzhen Zhongke Testing Technology Co., Ltd. recommends the owner to carry out five detection items: formaldehyde detection, benzene series material inspection, TVOC detection, ammonia gas detection and radioactive radon detection. The owner can select and test some other detection items based on the five basic projects.
Code for indoor environmental pollution control of civil building engineering (GB 50325-2010) is a compulsory national standard for indoor environmental pollution control. The standard stipulates the limit of radioactive index of inorganic nonmetallic materials used in civil construction projects; formaldehyde detection must be carried out for indoor wood-based panels; radon measurement must be carried out for soil of construction site before construction and expansion; radon emission of flame retardant and concrete admixture must be detected.

Indoor air quality standard BG / t18883-2002;
Indoor environmental quality acceptance of civil construction and interior decoration engineering BG / t50325-2010
Table 1 concentration limits of indoor environmental pollutants for civil construction projects
Class I civil construction engineering
Class II civil construction engineering
Radon (Bq / m3)
Formaldehyde (mg / m3)
Benzene (mg / m3)
Ammonia (mg / m3)
TVOG mg/m3
Table 2 setting of indoor environmental pollutant concentration detection points
Room area (M2)
Number of detection points
Not less than 3
No less than 5
Not less than 6
Not less than 9
Beijing Central Environmental Quality Monitoring Center
Free telephone: 4008861860
Laboratory Tel: 010-56546165 010-56546168
Fax: 010-56546167
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