National Ambient Air Quality Standards


 

Canada

Air Contaminant

Desirable

Acceptable

Tolerable

 

Sulphur Dioxide

ug/m3

ppb

ug/m3

ppb

ug/m3

ppb

1 hour

450

172

900

334

na

na

24 hours

150

57

300

115

800

306

Annual

30

11

60

23

na

na

 

Carbon Monoxide

mg/m3

ppm

mg/m3

Ppm

mg/m3

ppm

1 hour

15

13.1

35

30.6

na

na

8 hours

6

5.2

15

13.1

20

17.5

 

Nitrogen Dioxide

ug/m3

ppb

ug/m3

Ppb

ug/m3

ppb

1 hour

na

na

402

214

1000

532

24 hours

na

na

200

106

300

160

Annual

60

32

100

53

na

na

 

Ozone

ug/m3

ppb

ug/m3

Ppb

ug/m3

ppb

1 hour

100

51

160

82

300

153

24 hours

30

15

50

25

na

na

Annual

20

10

30

15

na

na

 

Suspended Particulates

ug/m3

ug/m3

ug/m3

24 hours

na

120

400

Annual

60

70

na

 

Hydrogen Fluoride **

ug/m3

ppb

ug/m3

Ppb

ug/m3

ppb

70 days

na

na

0.20

0.2

na

na

30 days

na

na

0.35

0.4

na

na

7 days

0.20

0.2

0.55

0.7

na

na

24 hours

0.40

0.5

0.85

1.0

na

na

 

Hydrogen Sulphide **

ug/m3

ppb

ug/m3

ppb

ug/m3

ppb

24 hours

na

na

5.0

3.6

na

na

1 hour

1.0

0.7

15.0

10.8

na

na

 

** Proposed

Source: BC Ministry of Environment, Land and Parks - Air Quality Impact Assessment, 2000.

 

 

United States of America

 

Sulphur Dioxide

ug/m3

ppb

24 hours

365

140

Annual

80

30

 

Carbon Monoxide

mg/m3

ppm

1 hour

40

35

8 hours

10

9

 

Nitrogen Dioxide

ug/m3

ppb

Annual

100

53

 

Ozone *

ug/m3

ppb

1 hour

235

120

8 hours

157

80

 

Particulate (PM-10)

ug/m3

ppm

24 hours

150

na

Annual

50

na

 

Particulate

ug/m3

ppm

24 hours

65

na

Annual

15

na

Lead

ug/m3

ppb

Quarterly

1.5

0.47

* See Notes

Source: EPA National Ambient Air Quality Standards, 2002.

 

 

World Health Organization and United Nations Economic Commission for Europe

Sulphur Dioxide

ug/m3

ppb

(Health Guideline)

10 minute mean

500

188

24 hour mean

125

47

Annual mean

50

18

(Vegetation Guideline)

24 hours

70

26

Annual

20

8

 

Carbon Monoxide

ug/m3

ppb

15 minutes

100 000

86 957

30 minutes

60 000

52 174

1 hour

30 000

26 087

8 hours

10 000

8 696

 

Nitrogen Dioxide

ug/m3

ppb

(Health Guideline)

1 hour

200

105

1 year

40

21

(Vegetation Guideline)

Annual mean

29

15

 

Ozone

ug/m3

ppb

(Health Guideline)

8 hours

120

60

(Vegetation Guideline)

 

 

Growing season mean

50

25

1 hour

150

75

8 hours

60

30

 

Lead

ug/m3

ppb

1 year

0.5

0.16

Source for Health Guideline: WHO Guidelines for Air Quality, 2000.
Source for Vegetation Guideline: The Atmosphere, Climate and Environment Information Program - Air Pollution & Acid Rain Fact Sheets Series: KS4 & A

 

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