Data & Statistics

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.

 

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