Who knows the grading standards of civil construction projects? In which document or specification is this standard stipulated?

According to article 104 of Code for Indoor Environmental Pollution Control of Civil Building Engineering,

According to the different requirements of controlling indoor environmental pollution, civil construction projects are divided into the following two categories:

(1) Class I civil construction projects: residential buildings, hospitals, old buildings, kindergartens, school classrooms and other civil construction projects;

Class II civil construction projects: office buildings, shops, hotels, cultural and entertainment venues, bookstores, libraries, exhibition halls, gymnasiums, public transport waiting rooms, restaurants, barbershops and other civil construction projects.

Extended data:

Thermal desorption direct injection gas chromatography. The standard adsorption tube and the sample adsorption tube are respectively placed in the thermal desorption direct injection device. After desorption at 250℃~325℃, the desorbed gas directly enters the gas chromatograph through the injection valve for chromatographic analysis, which should be qualitative by retention time and quantitative by peak area.

F.0.8 The concentration of benzene in the collected air samples shall be calculated according to the following formula:

C = (m - mo)/ V

Among them:

C-concentration of benzene in the collected air sample (mg/m3);

M—— the amount of benzene in the sample tube (μ g);

Mo—— the amount of benzene in the unsampled tube (μ g);

V-air volume (liter)

The concentration of benzene in the collected air samples should be converted into the concentration in the standard state according to the following formula:

cc = C( 10 1.3/P)(t+273/273)

Among them:

CC-concentration of benzene in air samples collected under standard conditions (mg/m3);

P—— Atmospheric pressure (kPa) at the sampling point.

T-temperature of sampling point during sampling (℃)

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