Dioxin Level 2019

Dioxins in Air - Measurement Results of 2019

Month
Sampling Date
Concentrations
Central/Western
Tsuen Wan
January 25-01-2019 0.021 --
25-01-2019 -- 0.029
February 12-02-2019 0.010 --
24-02-2019 -- 0.024
March 08-03-2019 0.010 --
20-03-2019 -- 0.009
April 25-04-2019 0.010 --
13-04-2019 -- 0.012
May 07-05-2019 0.010 --
19-05-2019 -- 0.008
June 06-06-2019 0.009 --
18-06-2019 -- 0.008
July 24-07-2019 0.008 --
12-07-2019 -- 0.008
August 11-08-2019 0.008 --
11-08-2019 -- 0.009
September 10-09-2019 0.008 --
22-09-2019 -- 0.025
October 10-10-2019 0.008 --
03-10-2019 -- 0.011
November 09-11-2019 0.033 --
14-11-2019 0.049 --
26-11-2019 -- 0.031
December 03-12-2019 0.032 --
19-12-2019 0.029 --
26-12-2019 -- 0.043
Annual Average
0.018 0.018

 

Chart of Dioxins in Air - Measurement Results at Central/Western monitoring station in the Past 5 Years (2015 - 2019)

Dioxins in Air - Measurement Results at Central/Western monitoring station in the past 5 years (2015 - 2019)

Chart of Dioxins in Air - Measurement Results at Tsuen Wan monitoring station in the Past 5 Years (2015 - 2019)

Dioxins in Air - Measurement Results at Tsuen Wan monitoring station in the Past 5 Years (2015 - 2019)

Chart of Dioxins in Air - Central/Western and Tsuen Wan monitoring station Annual Average (1998 - 2019)

Dioxins in Air - Central/Western and Tsuen Wan monitoring station Annual Average (1998 - 2019)


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:22:07 11-07-2020