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Dioxins in Air - Measurement Results of 2020

Month
Sampling Date
Concentrations
Central/Western
Tsuen Wan
January 14-01-2020 -- 0.021
31-01-2020 0.010 --
February 11-02-2020 0.014 --
23-02-2020 -- 0.009
March 12-03-2020 0.010 --
18-03-2020 -- 0.014
24-03-2020 -- 0.008
April 11-04-2020 -- 0.015
23-04-2020 0.012 --
May 11-05-2020 0.008 --
23-05-2020 -- 0.008
June 10-06-2020 0.008 --
22-06-2020 -- 0.008
July 10-07-2020 -- 0.008
22-07-2020 0.008 --
August 21-08-2020 -- 0.010
27-08-2020 0.029 --
September 08-09-2020 0.009 --
20-09-2020 -- 0.008
October 08-10-2020 -- 0.023
20-10-2020 0.025 --
November 13-11-2020 0.018 --
25-11-2020 -- 0.015
December 07-12-2020 0.034 --
19-12-2020 -- 0.032
Annual Average
0.0154 0.0138

 

Chart of Dioxins in Air - Measurement Results at Central/Western monitoring station in the Past 5 Years (2016 - 2020)

Dioxins in Air - Measurement Results at Central/Western monitoring station in the past 5 years (2016 - 2020)

Chart of Dioxins in Air - Measurement Results at Tsuen Wan monitoring station in the Past 5 Years (2016 - 2020)

Dioxins in Air - Measurement Results at Tsuen Wan monitoring station in the Past 5 Years (2016 - 2020)

Chart of Dioxins in Air - Central/Western and Tsuen Wan monitoring station Annual Average (1998 - 2020)

Dioxins in Air - Central/Western and Tsuen Wan monitoring station Annual Average (1998 - 2020)


NOTE :

The Trend
  • The dioxins levels in Hong Kong are low and the trend is generally downwards. Due to seasonal factors, the dioxins levels during the winter months are in general higher than that in the summer months.
 
The Procedure
  • The dioxins samples collected every month are sent to the Hong Kong Government Laboratory for analysis. The analytical work requires the use of sophisticated instruments and involves complex extraction processes which usually take at least two to three weeks. The Environmental Protection Department will post the data on the website once the report is available.
 
The Quantification Method
  • The dioxins figures are 24-hour average concentrations in pg I-TEQ /m3, and are expressed as toxic equivalent (I-TEQ) concentration of 2,3,7,8 - Tetrachlorodibenzodioxin (TCDD). They are calculated based on the International Toxic Equivalent Factors (I-TEF) of the North Atlantic Treaty Organization (NATO/CCMS) using 17 types of dioxin-like compound of structurally closely related chemical families and having similar chemical properties. 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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Last revision date: 01:07 24-06-2021