Summary of Ambient Air Monitoring (Winter)
from 2001 to 2009
|
Parameters
|
Hong Kong Air Quality Objective
|
Baseline
|
Monitoring Results | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
1993
|
2001
|
2002
|
2003
|
2004 |
2005
|
2006
|
2007
|
2008
|
2009
|
||
| 24 hr. Average |
Jan
|
Jan - Feb
|
Jan
|
Jan - Feb
|
Jan
|
Jan
|
Jan
|
Jan
|
Jan
|
Jan
|
|
| Sulphur Dioxide (SO2) ug/m3 |
350
|
8 - 19
|
2.6 - 15
|
2.6 - 9
|
3 -14
|
2.6 - 6
|
9.7 - 23.7 |
6.8 - 14.2
|
2.6 - 7.0 |
4.4 - 10.6
|
6.1 - 18.4 |
| Nitrogen Dioxide (NO2) ug/m3 |
150
|
38 - 90
|
26 - 56
|
20 - 54
|
36 - 63
|
20 - 38
|
49.5 - 83.8 | 46.8 - 74.8 | 25.4 - 56.7 |
37.5 - 89.0
|
64.7 - 91.7 |
| Total Suspended Particulates (TSP) ug/m3 |
260
|
43 - 109
|
62 - 115
|
44 - 145
|
104 - 171
|
80 - 177
|
84 - 194
|
84 - 108
|
56 - 152
|
63 - 115
|
60 - 105
|
| Respirable Suspended Particulates (RSP) ug/m3 |
180
|
27 - 69
|
47 - 83
|
39 - 119
|
76 - 132
|
57 - 137
|
60 - 140
|
42 - 84
|
40 - 90
|
46 - 87
|
40 - 71
|
| Nitrogen Oxides (NOx) ug/m3 |
---
|
27 - 107
|
52 - 126
|
42 - 120
|
44 - 123
|
35 - 74
|
87.2 - 151.8 | 68.3 - 189.6 |
41.0 - 120.9
|
65.0 - 192.7
|
85.0 - 128.3
|
| Non-methane Hydrocarbons (NMHC) mg/m3 |
---
|
0.1 - 1.1
|
0.2 - 0.5
|
0.17 - 0.36
|
0.32 - 0.75
|
1.56 - 2.36
|
0.41 - 2.36
|
1.30 - 1.79
|
0.65 - 1.39
|
0.42 - 0.88
|
0.19 - 0.42
|
| PCBs (total) ng/m3 |
---
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil
|
| Dioxins (total) pg/m3 |
---
|
0.131
|
0.168
|
0.080
|
0.073
|
0.111
|
0.200
|
0.049
|
0.088
|
0.062
|
0.070
|
| VOCs (total) ug/m3 |
---
|
88.3
|
37.2
|
11.88
|
168.57
|
38.55
|
28.54
|
8.72
|
17.32
|
20.92
|
10.11
|
| Prevailing Wind Direction |
---
|
North- east |
South- east
|
East
|
North
|
North- east
|
North- east
|
North |
North- east
|
North
|
North- east
|
Remarks :
-Meteorological data were obtained on the roof of Technical building at CWTC.
-The Total 2,3,7,8-TCDD Toxicity Equivalence is the product sum of the concentration of all seventeen 2,3,7,8-substituted PCDDs/PCDFs congeners and their respective Toxicity Equivalence Factor (TEF). For those congeners with concentration found below the MDL, half MDL is used for calculation.
