Summary of Ambient Air Monitoring (Summer)
from 1992 to 2000
|
Parameters |
Hong Kong Air Quality Objective
|
Baseline
|
Monitoring Results
|
|||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
1992
|
1993 |
1994 |
1995 |
1996 |
1997 |
1998
|
1999
|
2000
|
||
|
24 hr. Average
|
Sep
|
Jul |
Aug - Sep |
Oct |
Jun |
Sep |
Jun
|
Aug
|
Jun - Jul
|
|
| Sulphur Dioxide (SO2) ug/m3 |
350 |
5.0 - 19 |
24 - 128 |
16 - 32 |
<2.6 |
2.6 - 13.1 |
2.6 - 5.2
|
5.2 - 10.5
|
13 - 20
|
2.6 - 4
|
| Nitrogen Dioxide (NO2) ug/m3 |
150 |
21 - 46 |
27 - 62 |
69 - 167 |
34 - 49 |
9.4 - 35.7 |
30.1 - 65.8
|
18.8 - 35.7
|
23 - 46
|
6 - 46
|
|
Total Suspended Particulates (TSP) ug/m3 |
260 |
38 - 52 |
43 - 69 |
42 - 108 |
106 - 167 |
29 - 38 |
38 - 77
|
37 - 58
|
64 - 131
|
31 - 57
|
| Respirable Suspended Particulates (RSP) ug/m3 |
180 |
23 - 27 |
22 - 44 |
26 - 55 |
63 - 80 |
21 - 28 |
33 - 62
|
32 -46
|
39 - 89
|
20 - 34
|
|
Nitrogen Oxides (NOx) ppb |
--- |
33 - 90 |
47 - 144 |
47 - 162 |
20 - 40 |
8.0 - 23 |
30 - 59
|
24 - 77
|
63 - 87#
|
16 - 62
|
| Non-methane Hydrocarbons (NMHC) ppm |
--- |
<0.1 - 1.3 |
0.1 - 0.2 |
Note 1 |
0.5 - 0.6 |
0.13 - 0.2 |
0.24 - 0.31
|
0.25 - 0.3
|
0.31 - 0.41#
|
0.41 - 0.97
|
| PCBs (total) ng/m3 |
--- |
3 |
<39.4* |
Nil |
Nil |
Nil |
Nil
|
Nil
|
Nil
|
Nil
|
| Dioxins (total) pg/m3 |
--- |
0.084 |
0.059 |
0.030 |
0.149 |
0.014 |
0.084
|
0.017
|
0.079
|
0.039
|
| VOCs (total) ug/m3 |
--- |
104.1 |
70.6 |
<12.5 |
63 |
32.06 |
71.2
|
18.5
|
89.3
|
10.8
|
| Prevailing Wind Direction |
--- |
South- west |
South |
East |
East |
South- east |
North- east
|
South- west
|
South- west
|
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.
-Note 1 : Due to instrument failure, the NMHC data was not available for the 94's summer monitoring.
-* : The blank sample was contaminated.
-# Starting from August 1999, results of NOx and NMHC are expressed in ug/m3 and mg/m3 respectively
