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Dioxins in Air - Measurement Results of 1997
| Month |
Sampling Date |
Concentrations |
Central/Western |
Tsuen Wan |
| July |
6-7-1997 |
-- |
0.147 |
| 24-7-1997 |
0.063 |
-- |
| 28-7-1997 |
-- |
0.049 |
| August |
20-8-1997 |
0.246 |
-- |
| 26-8-1997 |
0.034 |
-- |
| September |
4-9-1997 |
0.226 |
0.219 |
| 10-9-1997 |
-- |
0.138 |
| 22-9-1997 |
0.068 |
0.076 |
| 24-9-1997 |
0.041 |
0.052 |
| 26-9-1997 |
0.125 |
-- |
| October |
10-10-1997 |
0.056 |
-- |
| 16-10-1997 |
0.165 |
0.219 |
| 19-10-1997 |
-- |
0.163 |
| 30-10-1997 |
-- |
0.356 |
| November |
4-11-1997 |
0.250 |
-- |
| 5-11-1997 |
-- |
0.133 |
| 18-11-1997 |
0.096 |
0.103 |
| December |
9-12-1997 |
0.131 |
0.193 |
Annual Average |
0.125 |
0.154 |
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NOTE :
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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