Figure 7.8: Nitrogen dioxide (NO2) levels and emissions in main centres of population
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Auckland (Penrose) NO2
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 |
