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Air Quality, Hazardous
Substance Standards (TCVN 5938, 1995)
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: ASEAN Project : Vietnam
: Implementing Regulations
Disclaimer
AIR
QUALITY:
MAXIMUM
ALLOWABLE CONCENTRATION
OF
HAZARDOUS SUBSTANCES IN AMBIENT AIR
TCVN
5938-1995
1.
Scope
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.
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Acknowledgement: Text courtesy of NEA Policy Division, MOSTE.
Disclaimer: APCEL has tried to ensure
the accuracy, reliability and completeness of the information in this database;
however, APCEL does not guarantee the accuracy, reliability or completeness
of this information. If you encounter an error, please notify us by e-mail
at lawapcel@nus.edu.sg.
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