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Contents

1. Introduction 1
2. Numbers of Survey Points and Samples 1
3. Substances Subject to Measurement and Methods of Showing the Measured Results   4

4. Methods of Measurement
5
5. Results of Survey 5
6. Conclusion 9
Table 1  Environmental Survey of Dioxins—FY 2000 Results (Summary Table) 9
Table 2  Changes in the Number of Survey Points and Concentration of Dioxins (Air) 10
Table 3  Changes in the Concentration of PCDDs and PCDFs at Continuous Survey Points (Air) 10
Figure 1 FY 2000 Results of Environmental Survey of Dioxins (Air)—Distribution of Concentrations 11
Figure 2  Changes in the Distribution of Concentrations of PCDDs and PCDFs in the Atmospheric Environment at Continuous Survey Points 12
Figure 3  FY 2000 Results of Environmental Survey of Dioxins (Water in Public Water Areas)—Distribution of Concentrations 13
Figure 4  FY 2000 Results of Environmental Survey of Dioxins (Groundwater)—Distribution of Concentrations 14
Figure 5  FY 2000 Results of Environmental Survey of Dioxins (Sediment in Public Water Areas)—Distribution of Concentrations 15
Figure 6 FY 2000 Results of Environmental Survey of Dioxins (Soil)—Distribution of Concentrations 16
Additional Table 1  FY 2000 Results of Environmental Survey of Dioxins (Air)—Number of Survey Points by Prefecture 17
Additional Table 2  FY 2000 Results of Environmental Survey of Dioxins (Water in Public Water Areas, Sediment, Groundwater)—Number of Survey Points by Prefecture 18
Additional Table 3  FY 2000 Results of Environmental Survey of Dioxins (Soil)—Number of Survey Points by Prefecture 19
Reference: Toxicity Equivalent Factor 20