At present, people are paying more and more attention to indoor pollution. They are looking for various inspection methods before moving into new houses, but everyone has different opinions on the specific closing time. Do you know that doors and windows should be closed for 12 hours before indoor air testing? Let’s explain: How to conduct indoor air formaldehyde testing.
How long should it be closed before formaldehyde testing?
1. For formaldehyde testing, first choose the testing standard basis: This is the first thing to understand before testing. Currently, our country has two standard controls. One is GB/T50325 and the other is GB/18883, both of which are national mandatory standards. It is suitable for indoor air quality acceptance of new buildings, renovation projects and post-decoration projects carried out by developers, builders and decoration companies.
Class I civil construction projects: Civil construction projects such as residential buildings, hospitals, elderly buildings, kindergartens, and school classrooms.
Class II civil construction projects: civil construction projects such as office buildings, shops, hotels, cultural institutions, bookstores, libraries, exhibition halls, gymnasiums, public transportation waiting rooms, restaurants, barber shops, etc.
2. The issue of when to close doors and windows during testing:
According to GB/T50325: For civil construction projects that use natural ventilation, testing and sampling should be carried out 1 hour after closing doors and windows; only formaldehyde , benzene, ammonia, Concentrations of five pollutant indicators: radon and TVOC. According to its GB/18883: testing and sampling should be carried out 12 hours after closing doors and windows; only the concentrations of five pollutant indicators, formaldehyde, benzene, ammonia, radon and TVOC, are tested.
3. Someone asked why it is 12 hours?
Because people spend about 90% of their time indoors, especially in winter. With the doors and windows closed and the air conditioner turned on, the time spent indoors is far more than 12 hours a day. If the indoor air is tested according to the "1 hour" standard, it is not only inconsistent with daily life, but also difficult to detect in such a short period of time. The detection of pollutants in the air is very likely to mislead the residents, making them think that the indoor air is qualified (in fact, it may not be qualified). In the future, they will not be harmed by harmful substances such as formaldehyde, , benzene series, , and TVOC in the air that exceed the standard. Self-aware. In addition, formaldehyde, benzene series, TVOC, etc. are all recognized by the World Health Organization as strong carcinogens and are the main causes of many diseases. If people stay in a room containing these strong carcinogens for a long time, they are very likely to suffer from aplastic anemia, leukemia, nasopharyngeal cancer, immune system diseases, infertility and other diseases. Pregnant women are pregnant with abnormal fetuses and stillbirths.
