That was not the case.
The indoor environment is worrying.
Because the building materials, furniture products and decoration materials used in urban rooms and office buildings in China contain substances that are extremely harmful to human health, such as formaldehyde, benzene, ammonia, radon and chlorinated hydrocarbons. These gradually released organic and inorganic pollutants are not discharged outdoors or decomposed indoors in time, and their concentrations gradually increase, which leads to the deterioration of indoor air quality and increasingly serious pollution, which has caused great harm to people's physical and mental health.
The "indoor" here includes not only the space where we live, but also all the indoor spaces where we work, study and live daily, such as offices, classrooms, conference rooms, hotels, theaters, libraries, shops, stadiums, gymnasiums, dance halls, waiting rooms and other indoor public places, as well as airplanes, buses and cars.
A study in the United States found that the indoor air pollution of many civil and commercial buildings is 2-5 times that of outdoor buildings, and some even exceed 100 times.
Therefore, "indoor air pollution" is listed as the third air pollution period after "soot pollution" and "oil pollution".
The International Health Organization estimates that about 30% of newly built and rebuilt buildings are pathogenic buildings, and more than 300 pollutants can be detected in the air. About 68% of human diseases are related to indoor pollution.
A lot of research by China National Environmental Monitoring Center found that the indoor formaldehyde concentration is 15~ 150 times higher than that of outdoor (indoor benzene concentration is 5~ 10 times higher than that of outdoor), and indoor formaldehyde concentration is more than 600 times higher than that of outdoor without ventilation.
According to the National Tenth Five-Year Plan Project "Study on Health Hazard Assessment Technology of Indoor Air Pollutants", the investigation and monitoring in six cities of Beijing, Tianjin, Shanghai, Chongqing, Changchun and Shizuishan found that after indoor decoration, the formaldehyde in the air exceeded the standard rate: 82.3 1% in winter and 93.65% in summer; Over-standard rate of volatile organic compounds: 70% in winter and 49.04% in summer.
It is conservatively estimated that more than 70% of newly renovated houses in China are not up to standard.
In 2003, China Consumers Association and Provincial Consumers Association monitored the indoor air of 53 renovated houses in Hangzhou. The results showed that the pollutants exceeded the standard by 79. 1%, and the highest exceeded the standard by more than 0 times 10.