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Dioxins in Air - Measurement Results of 2002

Month Sampling Date Concentrations
Central/Western Tsuen Wan
January 11-1-2002 0.129 0.105
29-1-2002 0.041 0.035
February 16-2-2002 0.037 0.036
28-2-2002 0.044 0.041
March 18-3-2002 0.037 0.035
30-3-2002 0.249 0.345
April 11-4-2002 0.037 0.058
23-4-2002 0.036 0.039
May 5-5-2002 0.036 0.035
17-5-2002 0.035 0.040
June 4-6-2002 0.036 0.035
22-6-2002 0.035 0.036
July 4-7-2002 0.059 0.099
22-7-2002 0.035 0.035
August 9-8-2002 0.036 0.036
21-8-2002 0.036 0.035
September 8-9-2002 0.055 0.059
26-9-2002 0.042 0.047
October 8-10-2002 0.077 0.038
20-10-2002 0.035 0.035
November 13-11-2002 0.065 0.073
25-11-2002 0.049 0.062
December 13-12-2002 0.075 0.072
25-12-2002 0.061 0.070
Annual Average 0.057 0.063

NOTE :

  1. Figures are 24-hour average concentrations on the day of sampling in pg I-TEQ /m3.
  2. 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).
  3. 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.