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Dioxins in Air - Measurement Results of 2003
| Month |
Sampling Date |
Concentrations |
Central/Western |
Tsuen Wan |
| January |
6-1-2003 |
0.123 |
0.114 |
| 18-1-2003 |
0.067 |
0.060 |
| February |
7-2-2003 |
0.042 |
0.035 |
| 23-2-2003 |
0.140 |
-- |
| March |
1-3-2003 |
0.044 |
-- |
| 26-3-2003 |
0.074 |
-- |
| April |
12-4-2003 |
0.036 |
-- |
| 24-4-2003 |
0.041 |
-- |
| May |
6-5-2003 |
0.036 |
-- |
| 18-5-2003 |
0.098 |
-- |
| June |
11-6-2003 |
0.036 |
-- |
| 23-6-2003 |
0.036 |
0.044 |
| July |
5-7-2003 |
0.036 |
0.037 |
| 17-7-2003 |
0.035 |
0.037 |
| August |
10-8-2003 |
0.036 |
0.037 |
| 22-8-2003 |
0.051 |
0.047 |
| September |
3-9-2003 |
0.036 |
0.043 |
| 15-9-2003 |
0.036 |
0.036 |
| October |
9-10-2003 |
0.062 |
0.061 |
| 21-10-2003 |
0.064 |
0.072 |
| November |
2-11-2003 |
0.177 |
0.218 |
| 14-11-2003 |
0.088 |
0.085 |
| December |
8-12-2003 |
0.111 |
0.103 |
| 20-12-2003 |
0.075 |
0.109 |
Annual Average |
0.066 |
0.071 |
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NOTE :
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Figures are 24-hour average concentrations on the day of sampling in pg I-TEQ /m3.
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The concentration of dioxins is expressed as toxic equivalent (I-TEQ) concentration of 2,3,7,8 - Tetrachlorodibenzodioxin (TCDD) based on the International Toxic Equivalent Factors (I-TEF) of the North Atlantic Treaty Organization (NATO/CCMS)
-
For congener concentrations that are lower than the estimated minimum sample detectable level (EMSDL), one half of the EMSDL is used in calculating the I-TEQ concentration
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