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Summary of Ambient Air Monitoring (Summer)
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from 1992 to 2000
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Parameters
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Hong Kong Air Quality Objective
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Baseline
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Monitoring Results
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|
92
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93
|
94
|
95
|
96
|
97
|
98
|
99
|
00
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24 hr. Average
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Sep
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Jul
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Aug - Sep
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Oct
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Jun
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Sep
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Jun
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Aug
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Jun - Jul
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| Sulphur Dioxide (SO2) ug/m3 |
350
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5.0 - 19
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24 - 128
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16 - 32
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<2.6
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2.6 - 13.1
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2.6 - 5.2
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5.2 - 10.5
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13 - 20
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2.6 - 4
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| Nitrogen Dioxide (NO2) ug/m3 |
150
|
21 - 46
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27 - 62
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69 - 167
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34 - 49
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9.4 - 35.7
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30.1 - 65.8
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18.8 - 35.7
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23 - 46
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6 - 46
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Total Suspended Particulates (TSP) ug/m3
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260
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38 - 52
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43 - 69
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42 - 108
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106 - 167
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29 - 38
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38 - 77
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37 - 58
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64 - 131
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31 - 57
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| Respirable Suspended Particulates (RSP) ug/m3 |
180
|
23 - 27
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22 - 44
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26 - 55
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63 - 80
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21 - 28
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33 - 62
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32 -46
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39 - 89
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20 - 34
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Nitrogen Oxides (NOx) ppb
|
---
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33 - 90
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47 - 144
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47 - 162
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20 - 40
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8.0 - 23
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30 - 59
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24 - 77
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63 - 87#
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16 - 62
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| Non-methane Hydrocarbons (NMHC) ppm |
---
|
<0.1 - 1.3
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0.1 - 0.2
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Note 1
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0.5 - 0.6
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0.13 - 0.2
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0.24 - 0.31
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0.25 - 0.3
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0.31 - 0.41#
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0.41 - 0.97
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| PCBs (total) ng/m3 |
---
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3
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<39.4*
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Nil
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Nil
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Nil
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Nil
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Nil
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Nil
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Nil
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| Dioxins (total) pg/m3 |
---
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0.084
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0.059
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0.030
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0.149
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0.014
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0.084
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0.017
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0.079
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0.039
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| VOCs (total) ug/m3 |
---
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104.1
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70.6
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<12.5
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63
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32.06
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71.2
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18.5
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89.3
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10.8
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| Prevailing Wind Direction |
---
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South- west
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South
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East
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East
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South- east
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North- east
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South- west
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South- west
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| 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. |
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-* : The blank sample was contaminated.
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-# Starting from August 1999, results of NOx and NMHC are expressed in ug/m3 and mg/m3 respectively
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