QCVN 06 : 2009BTNMT National technical regulation on hazardous substances in ambient air

SOCIALIST REPUBLIC OF VIETNAM

QCVN 06 : 2009/BTNMT

National technical regulation on hazardous substances in ambient air

HÀ NỘI - 2009


Foreword
QCVN 06:2009/BTNMT was complied by Drafting Committee of national technical regulations
on air quality; submited by Vietnam Enviroment Administration, Department of Science &
Technology, Department of Legal Affairs and promulgated in line with Circular No. 16/2009/TTBTNMT dated October 07, 2009 issued by Ministry of Natural Resources and Environment


NATIONAL TECHNICAL REGULATION ON HAZARDOUS SUBSTANCES IN
AMBIENT AIR
1. General Provision
1.1. Scope of Retutaion
1.1.1. This regulation deals with maximum allowable concentration of harmful
substances in ambient air.
1.1.2. This Regulation applies to assessment of ambient air quality and monitoring of air
pollution.
1.1.3. T his Regulation does not apply to air within manufacturing facilities and indoor
air.
1.2. Interpretation of terms
In this Regulation, the terms below are construed as follows:
1.2.1. An hour average: means the arithmetic average of the values measured in a period
of one hour for the measurements made more than once in an hour, or the value of
measurements made once in a period of one hour. The average value is measured several
times in 24 hours (a day) under a certain frequency. The largest average value within the

measured values obtained in 24 hours is taken to compare with limited values specified in
Table 1.
1.2.2. 8-hour average: means the arithmetic average of the values measured over a period
of 8 consecutive hours.
1.2.3. 24-hour average means the arithmetic average of the values measured over a period
of (a day).
1.2.4. Annual average: means the arithmetic average of the average value of 24 hours
measured over a period of one year.
2. TECHNICAL RETUTATION
Maximum allowable concentration of harmful substances in ambient air is specified in
Table 1.
Table 1: Maximum allowable concentration of harmful substances in ambient air
Unit: Microgam per cubic meter (μg/m3)
No

Parameter

Chemical
formula

Average time

Allowed
concentration

1 hour

0,03

Year

0,005

1 hour

0,3

Year

0,05

Inorganic substances
1
2

Arsenic (composite, As)
Arsenic hydride (Asin)

As
AsH3

3

Hydrochloric acid

HCl

24 hour

60

4

Nitric acid

HNO3

1 hour

400


5

Sulfuric acid

H2SO4

7

Chrysotile asbestoscontaining dust

Mg3Si2O3(OH)

8

Cadmium (including
oxides and metal fumes according Cd)

Cd

10

11

Chromium VI
(compounds, as Cr)

Hydrogen floride

Cr+6

HF

24 hour

150

1 hour

300

24 hour

50

Year

3

1 hour

150

24 hour

- 50

-

1 sợi/m3

1 hour

0,4

8 hour

0,2

Year

0,005

1 hour

100

24 hour

30

1 hour

0,007

24 hour

0,003

Year

0,002

1 hour

20

24 hour

5

Year

1

12

Hydrocyanua

HCN

1 hour

10

13

Manganese and
compounds (as MnO2)

Mn/MnO2

1 hour

10

24 hour

8

Year

0,15

14

Nickel (metals and
compounds, as Ni)

Ni

24 hour

1

15

Mercury (metals and
compounds, as Hg)

Hg

24 hour

0,3

Organic substances
16

Acrolein

CH2=CHCHO

1 hour

50

17

Acrylonitrile

CH2=CHCN

24 hour

45

Year

22,5

1 hour

50

24 hour

30

Year

54

1 hour

22

18

Aniline

C6H5NH2

19

Acrylic acid

C2H3COOH

20

Benzene

C6H6


Year

10

21

Benzidine

NH2C6H4C6H4NH2

1 hour

NDT

22

Cloroform

CHCl3

24 hour

16

Year

0,04

1 hour

5000

24 hour

1500

23

Hydrocabon

CnHm

24

Formaldehyde

HCHO

1 hour

20

25

Naphthalene

C10H8

8 hour

500

24 hour

120

26

Phenol

C6H5OH

1 hour

10

27

Tetracloetylen

C2Cl4

24 hour

100

28

Vinyl chloride

CICH=CH2

24 hour

26

The unpleasant odors
29

Ammonia

NH3

1 hour

200

30

Acetaldehyde

CH3CHO

1 hour

45

Year

30

31

Propionic acid

CH3CH2COOH

8 hour

300

32

Hydrosunfua

H2S

1 hour

42

33

Methyl mecarptan

CH3SH

1 hour

50

24 hour

20

24 hour

260

Year

190

One time
maximum

1000

1 hour

500

Year

190

1 hour

1000

34
35

36

Styrene
Toluen

Xylene

C6H5CH=CH2
C6H5CH3

C6H4(CH3)2
Remark: NDT: Not detected


3. DETERMINING METHOD
The method for determination of air quality parameters shall comply with guidance of
national standards or corresponding analytical standards of international organizations
- TCVN 5969:1995 (ISO 4220:1983) Ambient air – Determination of a gaseous acid air
pollution index – Titrimetric method with indicator or potentionmetric end-point
detection.
- TCVN 6502:1999 (ISO 10312:1995) Ambient air - Determination of asbestos fibres Direct - transfer transmission electron microscopy method.
The parameters specified in this Regulation not having national standards guiding the
analytical method shall apply the corresponding analytical standards of the international
organizations.
4. IMPLEMENTATION
This regulation replaces TCVN 5938:2005/BTNMT – Air quality - Maximum
permissible concentration of hazardous substances in ambient air which was promulgated
in line with Decision No. 22/2006/QD-BTNMT dated December 18, 2006 issued by
Ministry of Natural Resources and Environment
In case the national or internaltional standards referred in this Regulation amended and
supplemented or superseded shall be applied under new documents.