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Summary of Ambient Air Monitoring (Winter)

from 1993 to 2000

Parameters
Hong Kong Air Quality Objective
Baseline
Monitoring Results

93
94
95
96
97
98
99
00
24 hr. Average

Jan
Jan
Mar- Apr
Jan
Jan
Dec 97 - Jan 98
Feb
Mar- Apr
Sulphur Dioxide (SO2) ug/m3
350
8 - 19
27 - 88
N/A
2.6 - 7.9
2.6 - 18.3
2.6 - 10.5
2.6
2.6 - 3
Nitrogen Dioxide (NO2) ug/m3
150
38 - 90
88 - 121
71 - 160
39.5 - 64
24.5 - 94.1
26.3 - 94.1
16.9 - 43.3
8 - 19
Total Suspended Particulates (TSP) ug/m3
260
43 - 109
111 - 219
75 - 161
74 - 189
73 - 188
56 - 186
94 - 169*
60 - 109
Respirable Suspended Particulates (RSP) ug/m3
180
27 - 69
63 - 147
41 - 107
46 - 92
50 - 135
36 - 135
41 - 137*
44 - 79
Nitrogen Oxides (NOx) ppb
---
27 - 107
57 - 174
51 - 230
47 - 88
25 - 94
38 - 113
26 - 64
16 - 49#
Non-methane Hydrocarbons (NMHC) ppm
---
0.1 - 1.1
<0.1
N/A
<0.02
0.11 - 0.3
0.15 - 0.24
0.15 - 0.22
0.45 - 2.25#
PCBs (total) ng/m3
---
Nil
0.0326
Nil
Nil
Nil
Nil
Nil
Nil
Dioxins (total) pg/m3
---
0.131
0.020
0.011
0.053
0.144
0.063
0.022
0.038
VOCs (total) ug/m3
---
88.3
91.72
81.08
86.47
71.37
41.8
14.4
46.4
Prevailing Wind Direction
---
North- east
  East   
   East      
North- east
  North   
North- east
 
North- east
 
North- east
 

Remarks :
- N/A : invalid data due to failure of monitoring instrument.
- 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.
-* Active construction site situated near the sampling point. Construction site could be a source of suspended particulates and therefore it would contribute to the high TSP and RSP levels.

-# Starting from August 1999, results of NOx and NMHC are expressed in ug/m3 and mg/m3 respectively

 

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Last Revision Date : 10 June 2008