Legal analysis: According to the provisions of the Code for Indoor Environmental Pollution Control of Civil Construction Projects, the limits of indoor environmental pollution concentration in various construction sites are defined. Taking formaldehyde as an example, the limit value of formaldehyde in this specification is: 0.08 mg/m3 for civil construction projects (residential buildings, hospitals, old buildings, kindergartens, school classrooms and other civil construction projects); A class of civil construction projects (office buildings, shops, hotels, cultural and entertainment places, bookstores, libraries, gymnasiums, public transport waiting rooms, barbershops and other civil construction projects) formaldehyde 0. 10mg/m3.

Legal basis: Code for Indoor Environmental Pollution Control of Civil Construction Projects

3.6.2 The content of free formaldehyde in concrete admixture that can release formaldehyde should not be greater than 500mg/kg, and the determination method should conform to the current national standard "Limit of harmful substances in interior wall coatings of interior decoration materials" (GB 18582).

3.6.3 The free formaldehyde emission of glued wood structure materials used in civil construction projects should not be greater than 0. 12mg/m3, and its determination method should comply with the relevant provisions in Appendix B of this specification.

3.6.4 During the decoration of civil construction projects, the release of free formaldehyde from curtain walls and curtains should not be greater than 0. 12mg/m3, and its determination method should comply with the relevant provisions in Appendix B of this specification.

3.6.5 The release amount of free formaldehyde in indoor wallpaper of civil construction engineering should not be greater than 0. 12mg/m3, and its determination method should comply with the relevant provisions in Appendix B of this specification. The determination method should comply with the current national standard "Limit of harmful substances in interior decoration materials wallpaper" GB 18585.

3.6.6 The determination method of volatile content in PVC coiled material floor for indoor use in civil construction engineering shall comply with the relevant provisions in Appendix B of this specification. The determination method shall conform to the current national standard "Limit of harmful substances in PVC coiled floor for interior decoration materials" GB 18586, and the limit shall conform to the relevant provisions in Table 3.6.6.