Air Quality, Hazardous Substance Standards (TCVN 5938, 1995)
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1. ScopeAIR QUALITY:
MAXIMUM ALLOWABLE CONCENTRATION
OF HAZARDOUS SUBSTANCES IN AMBIENT AIR
TCVN 5938-1995
1.1 This standard specifies maximum allowable concentration of some organic and inorganic hazardous substances in ambient air.
1.2 This standard is applied to evaluation of ambient air quality and to monitoring of ambient air pollution status.
1.3 This standard is not applicable to the workplace air quality.
2. Limitation Values
Maximum allowable concentrations of the hazardous substances in ambient air are shown in the table l.
Table 1
Maximum Allowable Concentrations
of Some Hazardous Substances in Ambient Air (mg/m3)
| Nº | Substances | Chemical Formula | Average over 24hrs | Maximum One Occasion |
| 1 | Acrylonitrile | CH2=CHCN | 0,2 | - |
| 2 | Ammonia | NH3 | 0,2 | 0,2 |
| 3 | Aniline | C6H5NH2 | 0,03 | 0,05 |
| 4 | Anhydrious vanadium | V2O5 | 0,002 | 0,05 |
| 5 | Arsenic (inorganic compound, as As) | As | 0,003 | - |
| 6 | Hydrogen arsenic | AsH3 | 0,002 | - |
| 7 | Acetic acid | CH3COOH | 0,06 | 0,2 |
| 8 | Hydrochloric acid | HCl | 0,06 | - |
| 9 | Nitric acid | HNO3 | 0,15 | 0,4 |
| 10 | Sulfuric acid | H2SO4 | 0,1 | 0,3 |
| 11 | Benzene | C6H6 | 0,1 | 1,5 |
| 12 | Particles containing SiO2 | |||
| - dianas 85-90% SiO2 | 0,05 | 0,15 | ||
| - diatomic brick 50% SiO2 | 0,1 | 0,3 | ||
| - cement 10% SiO2 | 0,1 | 0,3 | ||
| - dolomite 8% SiO2 | 0,15 | 0,5 | ||
| 13 | Particles containing asbestos | none | none | |
| 14 | Cadmium (metal and oxide) as Cd | Cd | 0,001 | 0,003 |
| 15 | Carbon disulfide | CS2 | 0,005 | 0,03 |
| 16 | Carbon tetrachloride | CCl4 | 2 | 4 |
| 17 | Chloroform | CHCl3 | 0,02 | - |
| 18 | Tetraethyl lead | Pb(C2H5)4 | none | 0,005 |
| 19 | Chlorine | Cl2 | 0,03 | 0,1 |
| 20 | Benzidine | NH2C6H4C6H4NH2 | none | none |
| 21 | Chromium-metal and compound | Cr | 0,0015 | 0,0015 |
| 22 | 1,2 -Dichlorethane | C2H4Cl2 | 1 | 3 |
| 23 | DDT | C8H11Cl4 | 0,5 | - |
| 24 | Hydrogen fluoride | HF | 0,005 | 0,02 |
| 25 | Formaldehyde | HCHO | 0,012 | 0,012 |
| 26 | Hydrogen sulfide | H2S | 0,008 | 0,008 |
| 27 | Hydrogen cyanide | HCN | 0,01 | 0,01 |
| 28 | Manganese and compound (as MnO2) | Mn/MnO2 | 0,01 | - |
| 29 | Nickel (metal and compound) | Ni | 0,001 | - |
| 30 | Naphthalene | 4 | - | |
| 31 | Phenol | C6H5OH | 0,01 | 0,01 |
| 32 | Styrene | C6H5CH=CH2 | 0,003 | 0,003 |
| 33 | Toluene | C6H5CH3 | 0,6 | 0,6 |
| 34 | Trichloroethylene | ClCH=CCl2 | 1 | 4 |
| 35 | Mercury (metal and compound) | Hg | 0,0003 | -- |
| 36 | Vinylchloride | ClCH=CH2 | - | 13 |
| 37 | Gasoline | 1,5 | 5,0 | |
| 38 | Tetrachloroethylene | C2Cl4 | 0,1 | - |
Note: Standard analysis methods of concentration of the substances are specified in available current TCVNs.Top of Page
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