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Dioxins in Air - Measurement Results of 1999
| Month |
Sampling Date |
Concentrations |
Central/Western |
Tsuen Wan |
| January |
9-1-1999 |
-- |
0.103 |
| 12-1-1999 |
0.143 |
-- |
| February |
2-2-1999 |
0.469 |
1.149 |
| March |
10-3-1999 |
-- |
0.114 |
| 11-3-1999 |
0.190 |
-- |
| April |
3-4-1999 |
0.048 |
0.078 |
| May |
9-5-1999 |
0.038 |
0.036 |
| June |
2-6-1999 |
0.031 |
0.056 |
| July |
8-7-1999 |
-- |
0.051 |
| 9-7-1999 |
0.041 |
-- |
| 20-7-1999 |
0.059 |
0.043 |
| August |
12-8-1999 |
-- |
0.039 |
| 13-8-1999 |
0.066 |
-- |
| 25-8-1999 |
0.057 |
0.064 |
| September |
6-9-1999 |
0.045 |
0.052 |
| 24-9-1999 |
0.072 |
0.106 |
| October |
12-10-1999 |
0.052 |
0.054 |
| 30-10-1999 |
0.061 |
-- |
| November |
11-11-1999 |
0.069 |
0.073 |
| 19-11-1999 |
-- |
0.138 |
| 23-11-1999 |
0.082 |
0.099 |
| December |
5-12-1999 |
0.123 |
0.241 |
| 17-12-1999 |
0.087 |
0.079 |
Annual Average |
0.096 |
0.143 |
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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.
-
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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