|
 |
| Summary of Ambient Air Monitoring (Summer) |
|
from 2001 to 2007
|
Parameters
|
Hong Kong Air Quality Objective
|
Baseline
|
Monitoring Results
|
|
92
|
01
|
02
|
03
|
04
|
05
|
06
|
07
|
|
24 hr. Average
|
Sep
|
Aug
|
Aug
|
Jul
|
Jul
|
Jul
|
Jul
|
Jul
|
|
Sulphur
Dioxide
(SO2) ug/m3
|
350
|
5.0-19
|
2.6-3
|
2.6-6
|
2.6-3
|
2.6-3
|
2.6-4.1
|
6.3-7.4
|
|
|
Nitrogen
Dioxide
(NO2) ug/m3
|
150
|
21-46
|
10-36
|
12-26
|
5-10
|
5-7
|
12.4-31.5
|
|
12.3-21.2
|
|
Total
Suspended
Particulates
(TSP) ug/m3
|
260
|
38-52
|
41-95
|
27-59
|
19-45
|
31-81
|
31-47
|
|
32-53
|
|
Respirable
Suspended
Particulates
(RSP) ug/m3
|
180
|
23-27
|
31-76
|
14-41
|
15-30
|
24-63
|
25-38
|
|
26-45
|
|
Nitrogen
Oxides
(NOx) ug/m3
|
---
|
33-90
|
33-65
|
22-80
|
10-31
|
9-16
|
37.8-102.0
|
|
33.5-110.6
|
|
Non-methane Hydrocarbons
(NMHC) mg/m3
|
---
|
<0.1-1.3
|
0.47-1.03
|
0.66-1.05
|
0.74-1.63
|
1.29-2.16
|
0.85-1.42
|
|
0.53-1.15
|
|
PCBs (total)
ng/m3
|
---
|
3
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil
|
|
Dioxins (total)
pg/m3
|
---
|
0.084
|
0.039
|
0.037
|
0.037
|
0.038
|
0.038
|
0.038
|
0.037
|
|
VOCs (total)
ug/m3
|
---
|
104.1
|
14.4
|
15.79
|
33.69
|
145.67
|
81.9
|
|
Nil
|
|
Prevailing
Wind
Direction
|
---
|
South- west
|
North- east
|
North- east
|
South
|
South
|
North- east |
|
South- west
|
| 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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