Seal for 12 hours to measure how much formaldehyde is qualified

National standard for indoor air quality.

GB T18883-2002 Indoor Air Quality Standard.

Serial number, parameter category, parameter, unit, standard value, remarks.

1 Physical temperature 22-28 summer air conditioning 16-24 winter heating.

2 Relative humidity % 40-80 Air conditioning in summer 30-60 Heating in winter.

3 Air velocity m s

Air conditioning in summer. Heating in winter.

Fresh air volume. m3/h.Person.

Chemical. Sulfur dioxide SO2

mg cubic meters.

1-hour average.

Nitrogen dioxide NO2

mg cubic meters.

1-hour average.

Carbon monoxide CO

mg cubic meters.

1-hour average.

Carbon dioxide CO2

Daily average. Ammonia NH3mg cubic meter.

1-hour average.

Ozone O3mg cubic meters.

1-hour average.

Formaldehyde HCHO

mg cubic meters.

1-hour average.

Benzene c6h6mg cubic meters.

1-hour average.

Toluene C7H8

mg cubic meters.

1-hour average.

Xylene C8H10

mg cubic meters.

1-hour average.

Benzo[a]pyrene b(a)p

mg cubic meters.

Daily average. It can suck human particles PML0

mg cubic meters.

Daily average. Total volatile organic compounds (TVOC).

mg cubic meters.

8-hour average.

Biological. Radon-222rn

mg cubic meters.

Depending on the instrument.

Radioactivity. Total number of colonies.

bq cubic meters.

Annual average (action level).

The fresh air volume requires the standard value, and other parameters other than temperature and relative humidity require the standard value;

Action levels are reached at which intervention actions are recommended to reduce indoor radon concentrations.

GB T50325-2001 Indoor Air Quality Standard.

The revised version of the indoor environmental pollution control code for civil construction projects will be implemented on August 1.

With regard to the time it takes to close doors and windows during inspection, there are two standards issued by the state.

Code for Indoor Environmental Pollution Control of Civil Construction Projects GB T50325 (2013 Edition) is promulgated by the Ministry of Construction, which is a national mandatory standard and is required by law. Its detection condition is to close the doors and windows for 1 hour;

T18883-2002 "Indoor Air Quality Standard" is promulgated by the Ministry of Health and is a national recommended standard. It is the minimum standard for human health, involving 19 air quality indicators, which have detailed provisions for harmful substances such as formaldehyde, TVOC and benzene, which are strongly harmful to human health. Its detection condition is to close the doors and windows for 12 hours.

The reason why people have to be confined for 12 hours is because people spend about 90% of their time indoors, especially in winter and summer. With the doors and windows closed and the air conditioning on, the time spent indoors is well over 12 hours a day. If followed"1 hour"Standards to detect indoor air are not only inconsistent with daily life, but also difficult to detect pollutants in such a short period of time.

GB T18883---2002 "National Indoor Air Quality Standards" requires doors and windows to be closed for 12 hours before testing, which is more scientific, and this time period is close to the daily living state.

In addition, formaldehyde, benzene, and TVOC are all recognized by the World Health Organization as strong carcinogens and are the main causes of many diseases. If people stay in these rooms for a long time, they are very likely to suffer from aplastic anemia, nasopharyngeal cancer, immune system and other diseases.

Since people spend about 90% of their time indoors, especially in winter and summer. With the doors and windows closed and the air conditioning on, the time spent indoors is well over 12 hours a day.

If followed"1 hour"Standards to detect indoor air, not only does not conform to the state of daily life, but also difficult to detect pollutants in such a short period of time, it is very likely to mislead occupants, so that they think that indoor air is qualified (in fact, it may not be qualified), and in the future, they are not aware of the harm of harmful substances such as formaldehyde, benzene series, and TVOC in the air.

GB T18883---2002 "National Indoor Air Quality Standards" requires that doors and windows be closed for 12 hours before testing, which is more scientific, and this time period is close to the daily living state, that is, the occupants can generally ensure that they have the opportunity to open the windows for ventilation twice a day.

According to the Code for Indoor Environmental Pollution Control of Civil Construction Projects GB T50325 (2006 Edition), civil construction projects should be carried out at least seven days after the completion of the decoration project and before the project is handed over and accepted.

For individual decoration families, it is recommended that the decoration project is completed one month later, and all the furniture is fully in place one week after the inspection, at the same time, during this period should ensure sufficient ventilation, in order to facilitate the emission of toxic and harmful substances, so that the test results are closer to the actual use of the situation.

In addition, formaldehyde has been recognized as a first-class carcinogen by the World Health Organization's International Agency for Research on Cancer (IARC) as early as 2004, and is the main cause of many diseases. If people stay in these rooms with excessive carcinogens for a long time, they are very likely to suffer from aplastic anemia, leukemia, nasopharyngeal cancer, immune system diseases, infertility and other diseases, and pregnant women will be pregnant with teratogenesis, stillbirths and other phenomena.

Why do I have to close my doors and windows for 12 hours? Let me explain it to you.

Code for Indoor Environmental Pollution Control of Civil Construction Engineering (GB50325-2001).

Block for 1 h with formaldehyde, benzene, tvoc

National Indoor Air Quality Standard (GB T18883-2002).

Seal for 12 hours with formaldehyde, benzene, tvoc

Of the two standards, the former stipulates that windows and doors should be closed for one hour and the latter for 12 hours. You may ask: Why are there two standards for air testing?

It's just that the two standards are issued by different agencies, resulting in different standard values and different testing conditions.

The GB50325 standard was jointly issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and the Ministry of Construction in 2001, officially implemented in 2002, and revised in 2006, 2010 and 2013. It belongs to the environmental pollutants of construction projects. The control specification involves only five air indicators, namely formaldehyde, benzene series, ammonia, radon and TVOC.

The detection condition is to close the doors and windows for 1 hour.

Standard GB50325-2001

Second, GB T18883 is a national recommended standard issued by the State Environmental Protection Administration and the Ministry of Health in 2012 and is not mandatory. This is a low standard for the environmental health of human habitats, covering 19 air quality indicators, including detailed regulations for hazardous substances such as formaldehyde, TVOC and benzene, which seriously harm human health. The test condition was to close the doors and windows for 12 hours.

This is also the standard for routine testing.

GB T18883-2002 standard

GB T 18883 requires doors and windows to be closed for 12 hours before testing, which is more scientific. Because most families rest at night, especially in winter, they close their doors and windows and even keep the air conditioner on. They had to wait until the next morning to open the windows for ventilation.

The indoor time is about 12 hours, so the time limit is 12 hours. The amount of pollutants released and accumulated detected during this time can objectively reflect the true pollution situation in your home. No matter if it is closed for 2 hours, 24 hours, or 48 hours, the detection value does not conform to our normal living conditions.

Indoor air pollution

As early as 2004, formaldehyde was identified as a major carcinogen by the World Health Organization's International Agency for Research on Cancer (IARC) and is the leading cause of many diseases. If people stay in a room with strong carcinogens such as formaldehyde and benzene exceeding the standard for a long time, they are likely to suffer from aplastic anemia, leukemia, nasopharyngeal cancer, immune system diseases, infertility and other diseases. fetals, stillbirths and other phenomena.

Formaldehyde can also have irreversible effects on children's physical and mental development. Parents must be careful to avoid risks. Don't have the privilege of betting on your child's future.

In the newly renovated home, the harm of formaldehyde cannot be ignored, and it is necessary to do a formaldehyde test before moving in! Remind you that when you choose a formaldehyde testing agency, you must understand whether the other party's test is formal, whether the time of closing doors and windows strictly implements the provisions of national standards, and do not spend money on testing, the data obtained is not true!

First of all, the detection of formaldehyde must be carried out by closing doors and windows in advance. Because the test needs to be sampled in the indoor air, if it is ventilated, once the wind is strong, even if it exceeds the standard by 10 times, it may not be able to measure anything.

At present, there are two standards for national testing:

The first is in 2002, by the Ministry of Health and the State Environmental Protection Administration jointly promulgated the "Indoor Air Quality Standard" GB T18883-2002, mainly applicable to residential and office premises, in which the implementation standard for detecting formaldehyde is more than 12 hours in a closed condition, and the standard value is milligrams per cubic meter.

The second is in 2010, promulgated by the Ministry of Construction "Civil Construction Engineering Indoor Environmental Pollution Control Code" GB50325-2010, mainly applicable to residential and other civil buildings engineering acceptance, pollution control and other aspects, in which the implementation standard for detecting formaldehyde is 1 hour in a closed condition, and the standard value is milligrams per cubic meter.

At present, these two standards can be applied at the same time for housing, and neither has been abolished. In the general home decoration inspection, the first one is more commonly used, and the second is generally used in the acceptance of the project.

This is the national indicator test time, and some are 24 hours.

This makes the test value more accurate.

Formaldehyde detection of closed doors and windows scientific time this closed moment is not said to be which enterprise or individual rules, as early as 2001 and 2002 when the country has issued relevant rules, they are GB50325-2001 "Civil Construction Engineering Indoor Environmental Pollution Control Standards" and GB T18883-2002 "National Indoor Air Quality Standards". Of the two standards, the first rule has a time of 1 hour, and the latter has a time of 12 hours.

Why are there two standards, this is to say that the publication organization of the origin of these two standards, the difference in the publication organization, leads to the difference in object orientation, and the detection conditions are also different. 50325 is a national mandatory standard announced by the Ministry of Construction, which is mandatory by law and regulations. The environmental pollutant control standard for construction projects only involves five air targets, namely formaldehyde, benzene, ammonia, radon and TVOC.

The detection condition is to close the doors and windows for 1 hour. The 18883 is published by the Ministry of Health, which is a national recommended standard and is not mandatory to perform. The minimum standards for human health cover 19 air quality targets, with detailed rules for harmful substances such as formaldehyde, TVOC and benzene, which are highly harmful to human health.

The detection condition is to close the doors and windows for 12 hours.

Why should indoor formaldehyde testing be sealed for 12 hours? Because people spend about 90% of their time indoors, especially in winter and summer. With the doors and windows locked and the air conditioning turned on, the time spent indoors every day is far more than 12 hours, if followed"1 hour"The standard to detect indoor air is not only inconsistent with daily habits, but also difficult to detect pollutants in such a short period of time, which is very likely to mislead the occupants, so that they think that the indoor air is qualified (in fact, it may not be qualified), and they will not know that they will be damaged by serious formaldehyde, benzene series, TVOC and other harmful substances in the air in the future.

The accuracy of the test data needs to be guaranteed.

Since people spend about 90% of their time indoors, especially in winter and summer. With the doors and windows closed and the air conditioning on, the time spent indoors is well over 12 hours a day.

If followed"1 hour"Standards to detect indoor air, not only does not conform to the state of daily life, but also difficult to detect pollutants in such a short period of time, it is very likely to mislead occupants, so that they think that indoor air is qualified (in fact, it may not be qualified), and in the future, they are not aware of the harm of harmful substances such as formaldehyde, benzene series, and TVOC in the air.

Therefore, it is more scientific to close doors and windows for 12 hours before testing in GB T18883---2002 "National Indoor Air Quality Standards", which is close to the daily living state, that is, residents can generally ensure that they have the opportunity to open windows for ventilation twice a day.

"12 hours" and "1 hour" are based on the "Indoor Air Quality Standards" and the "Code for Indoor Environmental Pollution Control of Civil Construction Projects" respectively. The former controls the indoor environmental quality of people's newly installed residences under normal activities, and conducts comprehensive testing of physical, chemical, biological and radioactive indicators (a total of 19 items) in the indoor air, and closes doors and windows for 12 hours before testing. The 12-hour standard is stricter and more comprehensive, and is more in line with the health requirements of residents for indoor air.

People spend about 90% of their time indoors, especially in winter and summer in the case of closed doors and windows to turn on the air conditioner, the time spent indoors every day is far more than 12 hours, if the indoor air is detected according to the "1 hour" standard, it is not only not in line with the state of daily life, but also difficult to detect pollutants in such a short period of time, it is very likely to mislead the occupants, so that they think that the indoor air is qualified (in fact, it may not be qualified), and in the future, the air will be affected by excessive formaldehyde, benzene, The infringement of harmful substances such as TVOC is not yet known.

Formaldehyde hazards:Formaldehyde, benzene, TVOC, etc. are identified by the World Health Organization as strong carcinogens, is the main cause of many diseases, people stay in these strong carcinogens for a long time in the room, it is very likely to suffer from aplastic anemia, leukemia, nasopharyngeal cancer, immune system diseases, infertility and other diseases, pregnant women pregnant with teratogenesis, stillbirth, etc.