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Dioxins in Air - Measurement Results of 1998
| Month |
Sampling Date |
Concentrations |
Central/Western |
Tsuen Wan |
| January |
2-1-1998 |
0.211 |
0.143 |
| February |
7-2-1998 |
-- |
0.349 |
| March |
3-3-1988 |
0.126 |
0.132 |
| 21-3-1998 |
0.085 |
-- |
| April |
-- |
-- |
-- |
| May |
2-5-1998 |
-- |
0.033 |
| 6-5-1998 |
-- |
0.038 |
| 12-5-1998 |
0.042 |
-- |
| 14-5-1998 |
0.037 |
-- |
| June |
7-6-1998 |
0.064 |
0.043 |
| July |
1-7-1998 |
0.021 |
-- |
| 3-7-1998 |
-- |
0.023 |
| August |
6-8-1998 |
0.019 |
0.023 |
| September |
11-9-1998 |
0.045 |
0.060 |
| October |
5-10-1998 |
0.088 |
0.070 |
| November |
10-11-1998 |
0.108 |
0.096 |
| December |
3-12-1998 |
0.093 |
-- |
Annual Average |
0.078 |
0.092 |
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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)
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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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