CIRCULAR

DEFINING NATIONAL TECHNICAL REGULATIONS ON ENVIRONMENT

MINISTER OF NATURAL RESOURCES AND ENVIRONMENT

Pursuant to the Law on Standards and Technical Regulations dated June 29, 2006;

Pursuant to the Decree No.127/2007/ND-CP dated August 01, 2007 of the Government detailing the implementation of some Articles of the Law on Standards and Technical Regulations;

Pursuant to the Decree No.25/2008/ND-CP dated March 04, 2008 of the Government regulating functions, duties, powers and organizational structure of the Ministry of Natural Resources and Environment;

At the request of the General Director of General Department of Environment, Director of Department of Science and Technology, Director of Department of Legal Affairs,

REGULATES:

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1. QCVN 05:2009/BTNMT - National Technical Regulation on ambient air quality;

2. QCVN 06:2009/BTNMT - National Technical Regulation on a number of toxic substances in ambient air.

Article 2. This Circular takes effect from January 01, 2010.

Article 3. General Director of General Department of Environment and heads of the units under the Ministry of Natural Resources and Environment, Directors of the Departments of Natural Resources and Environment of provinces and cities directly under the Central Government and other concerned organizations and individuals are responsible for the implementation of this Circular./.

FOR MINISTER
DEPUTY MINISTER




Nguyen Xuan Cuong

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NATIONAL TECHNICAL REGULATION ON AMBIENT AIR QUALITY

Preamble

QCVN 05: 2009/BTNMT compiled by the drafting Committee of National Technical Regulation on air quality, General Department of Environment, Department of Science and Technology, Department of Legal Affairs submit for approval and issue together with the Circular No.16/2009/TT-BTNMT dated October 07, 2009 of the Minister of Natural Resources and Environment.

NATIONAL TECHNICAL REGULATION ON AMBIENT AIR QUALITY

1. GENERAL PROVISIONS

1.1. Scope of application

1.1.1. This Regulation prescribes limited value of the basic parameters, including sulfur dioxide (SO₂), carbon (CO), nitrogen oxides (NO_x), ozone (O₃), suspended dust, dust PM10 (dust ≤ 10 μm) and lead (Pb) in ambient air.

1.1.2. This Regulation is applied to assess ambient air quality and monitor air pollution.

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1.2. Interpretation of terms

In this Regulation the following terms 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 REGULATION

Limited values ​​of the basic parameters in the ambient air specified in Table 1

Table 1: Limited values ​​of basic parameters in the ambient air

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No.

Parameters

An hour average

3-hour average

24-hour average

Annual average

1

SO₂

350

...

...

...

125

50

2

CO

30000

10000

5000

-

3

...

...

...

200

-

100

40

4

O₃

180

120

80

...

...

...

5

Suspended dust (TSP)

300

-

200

140

6

Dust ≤ 10 μm (PM10)

-

...

...

...

150

50

7

Pb

-

-

1.5

0.5

Note: Mark (-) means not describing

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Method of analysis to determine the parameters of air quality under the guidance of the National Standards or corresponding Standards of analysis of the international organizations.

- TCVN 5978:1995 (ISO 4221:1980). Air quality. Determination of mass concentration of sulfur dioxide in ambient air. Photometric method using Thorin.

- TCVN 5971:1995 (ISO 6767:1990) ambient air. Determination of mass concentration of sulfur dioxide. Tetrachloromercurat Method (TCM)/Pararosanilin.

- TCVN 7726:2007 (ISO 10498:2004) ambient air. Determination of sulfur dioxide. Ultraviolet fluorescence method.

- TCVN 5972:1995 (ISO 8186:1989) ambient air. Determination of mass concentration of carbon monoxide (CO). Gas chromatographic method.

- TCVN 7725:2007 (ISO 4224:2000) ambient air. Determination of carbon monoxide concentration. Non-dispersive infrared spectrometric method.

- TCVN 5067:1995 Air quality. Quantitative methods of determining the content of dust.

- TCVN 6138:1996 (ISO 7996:1985) ambient air. Determination of mass concentration of nitrogen oxides. Optical chemical methods.

- TCVN 7171:2002 (ISO 13964:1998) Air quality. Determination of ozone in ambient air. Photometric method of ultraviolet rays.

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- TCVN 6152:1996 (ISO 9855:1993) ambient air. Determination of dust lead content of aerosols collected on the filters. Method of atomic absorption spectrometry.

4. ORGANIZATION OF IMPLEMENTATION

This Regulation is applied to replace Vietnam standard TCVN 5937:2005 - Air quality - Standard of ambient air quality issued together with the Decision No.22/2006/QD-BTNMT dated December 18, 2006 by Minister of Natural Resources and Environment required the application of Vietnam standards on the environment.

Where the national or international standards on analytical methods cited in this Regulation is amended, supplemented or replaced, then shall apply the new documents.

QCVN 06:2009/BTNMT

NATIONAL TECHNICAL REGULATION ON HAZARDOUS SUBSTANCES IN AMBIENT AIR

Foreword

QCVN 06:2009 /BTNMT is compiled and submitted by Vietnam Environment Administration, Science and Technology Office, and Legal Department, promulgated together with Circular No. 16/2009/TT-BTNMT dated October 07, 2009 of the Minister of Natural Resources and Environment.

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NATIONAL TECHNICAL REGULATION ON HAZARDOUS SUBSTANCES IN AMBIENT AIR

1. GENERAL PROVISIONS

1.1. Scope

1.1.1. This Regulation prescribes permissible maximum concentrations of some hazardous substances in ambient air.

1.1.2. This Regulation is applied to assessment of ambient air quality and supervision of air pollution.

1.1.3. This Regulation is not applied to assessment of air quality and supervision of air pollution.

1.2. Interpretation of terms

In this Regulation, the terms below are construed as follows:

1.2.1. Average value per 01 hour: the arithmetic mean of values obtained from multiple measurements over 01 hour or from a single measurement over 01 hour. The mean value is measured many times over 24 hours with a certain frequency. The highest mean value among the values obtained over 24 hours shall be compared to the limited value in Table 1.

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1.2.3. Average value per 24 hour: the arithmetic mean of values obtained over 24 hours.

1.2.4. Average value per year: the arithmetic mean of mean values per 24 hours obtained after a year.

2. TECHNICAL REGULATIONS

Permissible maximum concentrations of some hazardous substances in ambient air are provided in Table 1.

Table 1. Permissible maximum concentrations of some hazardous substances in ambient air

Unit: microgram per cube meter (μg/m³)

No.

Substance

Chemical formula

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Permissible concentration

Inorganic substances

1

Arsenic (compounds, expressed as As)

As

1 hour

0.03

Year

0.005

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Arsenic hydride (Arsine)

AsH₃

1 hour

0.3

Year

0.05

3

Hydrochloric acid

HCl

...

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...

60

4

Nitric acid

HNO₃

1 hour

400

24 hours

150

5

...

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...

H₂SO₄

1 hour

300

24 hours

50

Year

3

6

Dust having > 50% silicon oxide

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...

1 hour

150

24 hours

- 50

7

Dust having chrysotile asbestos

Mg₃Si₂O₃(OH)

-

1 thread/m³

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Cadmium (smoke that contain oxides and metals – expressed as Shareholder)

Cd

1 hour

0.4

8 hours

0.2

Year

0.005

9

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Cl₂

1 hour

100

24 hours

30

10

Chrome VI (compounds, expressed as Cr)

Cr⁺⁶

1 hour

...

...

...

24 hours

0.003

Year

0.002

11

Hydrogen fluoride

HF

1 hour

20

...

...

...

5

Year

1

12

Hydrogen cyanide

HCN

1 hour

10

13

...

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Mn/MnO₂

1 hour

10

24 hours

8

Year

0.15

14

Nickel (metals and compounds, expressed as Ni)

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...

24 hours

1

15

Mercury (metals and compounds, expressed as Hg)

Hg

24 hours

0.3

Organic substances

16

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CH₂=CHCHO

1 hour

50

17

Acrylonitrile

CH₂=CHCN

24 hours

45

Year

...

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18

Aniline

C₆H₅NH₂

1 hour

50

24 hours

30

19

Acrylic acid

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...

Year

54

20

Benzene

C₆H₆

1 hour

22

Year

10

...

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...

Benzidine

NH₂C₆H₄C₆H₄NH₂

1 hour

NF

22

Chloroform

CHCl₃

24 hours

16

...

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...

0.04

23

Hydrocarbon

C_nH_m

1 hour

5000

24 hours

1500

24

...

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HCHO

1 hour

20

25

Naphtalene

C₁₀H₈

8 hours

500

24 hours

...

...

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26

Phenol

C₆H₅OH

1 hour

10

27

Tetrachloroethylene

C₂Cl₄

24 hours

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28

Vinyl chloride

CICH=CH₂

24 hours

26

Odor-Producing Substances

29

Ammonia

NH₃

...

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...

200

30

Acetaldehyde

CH₃CHO

1 hours

45

Year

30

31

...

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...

CH₃CH₂COOH

8 hours

300

32

Hydrogen sulfide

H₂S

1 hours

42

33

...

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...

CH₃SH

1 hours

50

24 hours

20

34

Styrene

C₆H₅CH=CH₂

24 hours

...

...

...

Year

190

35

Toluene

C₆H₅CH₃

Only once

1000

1 hours

500

...

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190

36

Xylene

C₆H₄(CH₃)₂

1 hours

1000

Notes: NF = Not found

3. DETERMINATION METHOD

The method for determination of air quality indicators shall comply with national standards or corresponding analysis standards of international organizations:

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- TCVN 6502:1999 (ISO 10312:1995) - Ambient air - Determination of asbestos fibers - Direct transfer transmission electron microscopy method.

Corresponding analysis standards of international organizations shall apply to determination of the indicators that are not regulated by any national standard

4. IMPLEMENTATION 

This Regulation supersedes TCVN 5938:2005 – Air quality - Permissible maximum concentrations of hazardous substances in ambient air promulgated together with Decision No. 22/2006/QĐ-BTNMTdated December 18, 2006 of the Minister of Natural Resources and Environment.

When any of the national or international standards referred to in this Regulation is revised or replaced, the newer ones shall apply.