At present, there are mainly two standards for indoor air quality, namely the mandatory national standard, the Code for Indoor Environmental Pollution Control of Civil Construction Engineering and the recommended national standard, the Indoor Air Quality Standard. "The concerns of the two standards are not exactly the same, including the testing time and the testing items. The Indoor Air Quality Standard is relatively higher, but the two standards also have their own contradictions." Luo Xin said that indoor air quality is related to weather conditions, furniture, testing time, temperature, humidity and other factors, A qualified test does not mean that it is always qualified. In addition, formaldehyde emission will last for a long time, which brings difficulties to indoor air quality testing.
"Most public buildings have undergone secondary decoration before being put into use. For the sake of the health of users and the public, such buildings should comply with the Indoor Air Quality Standards before being put into use Testing; The specific test items and the number and proportion of sampling rooms shall be determined according to the air quality test results at the completion acceptance and the possible new pollution sources introduced by the secondary decoration. At present, the common practice in the industry is to detect five chemical pollutants, namely formaldehyde, benzene, toluene, xylene, and total volatile organic compounds (TVOC). " Shen Qianjin believes that recommendatory standards cannot be understood as standards that can not be implemented. For buildings or services with public attributes and involving people's livelihood, owners or service providers should actively commit to and implement relevant standards.
"We understand that the reason why the Indoor Air Quality Standard is a recommendatory standard should be due to the differences in regional habits and economic levels across the country, the differences in construction materials and functions of various buildings, and the 18 indicators involved in the standard are difficult to be uniformly specified." Shen Qianjin pointed out that the standard has been implemented for more than 10 years, and some problems have also occurred in practical application, It cannot adapt to the characteristics and testing requirements of various buildings at this stage. It is suggested that when revising, the regulations on classification of buildings in different areas, different types and different purposes, especially public buildings should be carried out; The existing 18 control indicators were adjusted, and some indicators were identified as mandatory indicators.
