|
Summary of Ambient Air Monitoring (Winter)
|
Parameters
|
Hong Kong Air Quality Objective
|
Baseline
|
Monitoring Results
|
|
93
|
01
|
02
|
03
|
04
|
05
|
06
|
07
|
08
|
|
24 hr. Average
|
Jan
|
Jan - Feb
|
Jan
|
Jan - Feb
|
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
|
|
4.4 - 10.6
|
|
Nitrogen Dioxide (NO2) ug/m3
|
150
|
38 - 90
|
26 - 56
|
20 - 54
|
36 - 63
|
20 - 38
|
49.5 - 83.8
|
46.8 - 74.8
|
|
37.5 - 89.0
|
|
Total Suspended Particulates (TSP) ug/m3
|
260
|
43 - 109
|
62 - 115
|
44 - 145
|
104 - 171
|
80 - 177
|
84 - 194
|
84 - 108
|
|
63 - 115
|
|
Respirable Suspended Particulates (RSP) ug/m3
|
180
|
27 - 69
|
47 - 83
|
39 - 119
|
76 - 132
|
57 - 137
|
60 - 140
|
42 - 84
|
|
46 - 87
|
|
Nitrogen Oxides (NOx) ug/m3
|
---
|
27 - 107
|
52 - 126
|
42 - 120
|
44 - 123
|
35 - 74
|
87.2 - 151.8
|
68.3 - 189.6
|
|
65.0 - 192.7
|
|
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
|
|
0.42 - 0.88
|
|
PCBs (total) ng/m3
|
---
|
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
|
|
0.062
|
|
VOCs (total) ug/m3
|
---
|
88.3
|
37.2
|
11.88
|
168.57
|
38.55
|
28.54
|
8.72
|
|
20.92
|
|
Prevailing Wind Direction
|
---
|
North- east
|
South- east
|
East
|
North
|
North- east
|
North- east
|
North
|
|
North
|
|
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. |
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