Summary of Ambient Air Monitoring (Dioxins) (Cheung Ching Estate, Tsing Yi)

Year	Concentration (pg I-TEQ/m³)
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
1999										0.044	0.116	0.122
2000	0.076	0.055	0.038	0.038	0.038	0.036	0.039	0.039	0.103	0.058	0.070	0.046
2001	0.168	0.060	0.193	0.042	0.037	0.037	0.038	0.039	0.047	0.048	0.064	0.059
2002	0.080	0.036	0.035	0.040	0.041	0.038	0.045	0.037	0.035	0.054	0.039	0.042
2003	N/A	0.073	0.067	0.101	0.046	0.052	0.037	0.040	0.047	0.059	0.062	0.069
2004	0.111	0.057	0.063	0.046	0.038	0.037	0.038	0.038	0.091	0.092	0.061	0.160
2005	0.200	0.035	0.062	0.037	0.041	0.050	0.038	0.037	0.052	0.084	0.036	0.138
2006	0.049	0.080	0.112	0.091	0.038	0.037	0.038	0.073	0.050	0.050	0.080	0.068
2007	0.088	0.048	0.072	0.054	0.051	0.044	0.037	0.038	0.056	0.066	0.067	0.136
2008	0.062	0.080	0.068	0.089	0.063	0.0376	0.0395	0.040	0.037	0.060	0.103	0.128
2009	0.070	0.044	0.107	0.088	0.037	0.038	0.010	0.066	0.013	0.064	0.102	0.207
2010	0.049	0.016	0.010	0.019	0.021	0.222	0.037	0.010	0.010	N/A	N/A	N/A
2011	0.208	0.032	0.065	0.031	0.009	0.010	0.010	0.011	0.110	0.014	0.046	0.144
2012	0.075	0.073	0.077	0.036	0.001	0.011	0.010	0.010	0.010	0.049	0.013	N/A
2013	0.030	0.025	0.157	0.191	0.033	0.011	0.022	0.010	0.030	0.070	0.035	0.184
2014	0.118	0.066	0.044	0.018	0.012	0.015	0.022	0.014	0.070	0.037	0.024	0.037
2015	0.187	0.062	0.089	0.013	0.018	N/A	0.010	0.010	0.013	0.025	0.037	0.033
2016	0.109	0.036	0.010	0.012	0.015	0.038	0.009	0.010	0.010	0.146	0.017	0.041
2017	0.055	0.022	0.011	0.041	0.019	0.010	0.010	0.010	0.010	0.018	0.039	0.049
2018	0.057	0.016	0.028	0.011	0.010	0.010	0.009	0.009	0.009	0.010	0.010	0.010
2019	0.036	0.021	0.013	0.012	0.020	0.010	0.027	0.022	0.010	0.016	0.028	0.031
2020	0.016	0.010	0.009	0.010	0.009	0.009	0.156	0.420	0.029	0.011	0.042	0.010
2021	0.023	0.010	0.019	0.010	0.009	0.032	0.025	0.029	0.018	0.024	0.020	0.029
2022	0.028	0.028	0.025	0.029	0.031	0.025	0.029	0.027	0.032	0.030	0.031	0.025
2023	0.027	0.027	0.029	0.030	0.031	0.030	0.031	0.024	0.031	0.026	0.026	0.028
2024	0.026	0.029	0.031	0.029	0.030	0.026	0.030	0.031	0.033	0.028	0.031	0.017
2025	0.031	0.026	0.028	0.016	0.032	0.029	0.030	0.031

Notes:

1. Method of Determination: USEPA Method T09: Method for the Determination of Polychorinated Dibenzo-p-Dioxins (PCDDs) in Ambient Air using High-Resolution Gas Chromatography/High-Resolution Mass Spectrometry (HRGC/HRMS)
2. The Total 2,3,7,8-TCDD Toxicity Equivalence is the product sum of the concentration of all seventeen 2,3,7,8-substituted PCDDs/PCDFs congeners and their respective Toxicity Equivalence Factor (TEF). For those congeners with concentration found below the method detection limit (MDL). half MDL is used for calculation.
3. Result for Jan. 2003 was not available because of test failure.
4. No monitoring results for Oct., Nov. and Dec. 2010 because incineration system was shut down for upgrade works.
5. No monitoring result for Dec. 2012 because incineration system was shut down for overhaul.
6. Ambient air samples for Jan. to May 2013 were taken at the adjacent Ching Wai House because Ching Yung House was under renovation works.
7. No monitoring result for June 2015 because incineration system was shut down for maintenance.
8. Ambient air samples for July 2019 to May 2020 were taken at the adjacent Ching Wai House because Ching Yung House was under renovation works.
9. Dioxins samples are collected for analysis by an accredited laboratory every month. The analytical work will usually take several weeks. The Environmental Protection Department will post the data on the website once the report is available.
10. Regarding the ambient dioxins monitoring results, the Environmental Protection Department (EPD) will conduct data verification on the data submitted by the CWTC and then compile all the monitoring results, including dioxins, SOx and NOx, etc, in a detailed report for submission to the Community Affairs Committee of the Kwai Tsing District Council for information on a regular basis. Owing to the time for data verification and report compilation, the release of data and submission of report would normally be after a lapse of several months from the sampling date. To expedite the release of ambient dioxins level, EPD has separately handled the release of the ambient dioxins monitoring results and the report to Kwai Tsing District Council since November 2019 with a view to publishing the ambient dioxins data as soon as possible.