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Figure 7.8:

Nitrogen dioxide (NO2) levels and emissions in main centres of population Return to the point in the document where this figure is located.

Auckland (Penrose) NO2

Legend for the graphs.

Wellington (Upper Hutt) NO2

Auckland (Khyber Pass Road) NO2

Christchurch (St Albans) NO2

Notes:

(1) The size of the pie graphs is proportional to the amount of emissions in each location represented.

(2) Auckland emissions represent daily emissions throughout the year rather than daily emissions during winter.

(3) Dunedin reports on industrial and domestic emissions only and therefore is not graphed or shown on the map.

(4) µg/m3 = micrograms per cubic metre.

Data sources: Data compiled from Air and Environmental Services Ltd, 2001; Auckland Regional Council, 2006a; Auckland Regional Council, 2006b; Environment Canterbury, 2004; Environment Canterbury, 2006; Environment Waikato, 2006b; Greater Wellington Regional Council, 2005.

Text description of figure

Emissions of NOx by sector

 

Auckland

Christchurch (winter)

Wellington (winter)

Hamilton (winter)

Emissions

35000 t/yr

21900kg/day

34470kg/day

5425kg/day

Sector

Transport

83.00%

81.00%

93.00%

91.00%

Domestic

1.00%

6.00%

3.00%

3.00%

Industry

13.00%

13.00%

3.00%

4.00%

Other

3.00%

 

2.00%

2.00%

 

Nitrogen dioxide (NO2) levels and emissions in main centres of population

 

Auckland (Penrose)

Auckland (Khyber Pass Road)

Christchurch (St Albans)

Wellington (Upper Hutt)

Year

1hr max (µg/m3)

Annual average

1hr max (µg/m3)

Annual average

1hr max (µg/m3)

Annual average

1hr max (µg/m3)

Annual average

1988

 

 

 

 

194

 

 

 

1989

 

 

 

 

238

24

 

 

1990

102.3

16.5

 

 

412

29

 

 

1991

64.9

13.0

 

 

228

25

 

 

1992

147.8

25.0

 

 

162

 

 

 

1993

128.0

17.5

 

 

124

 

 

 

1994

67.2

18.4

 

 

85

 

 

 

1995

83.1

22.2

 

 

132

18

 

 

1996

113.6

20.4

 

 

200

15

 

 

1997

96.5

24.2

 

 

119

15

 

 

1998

155.3

21.8

418

62

93

14

 

 

1999

117.4

25.1

246

55

112

14

 

 

2000

169.9

23.0

434

57

108

13

 

 

2001

311.2

23.4

277

58

106

17

106

11

2002

123.9

26.6

250

59

117

 

59

9

2003

73.9

24.0

239

51

120

16

60

9

2004

98.8

23.6

271

58

154

16

117

9

2005

236.0

24.5

264

50

77

16

105

4