Survey results of dioxins in the atmosphere in Aoba Ward

Last Updated April 10, 2024

1 Purpose of the Survey

In a dioxin environmental survey in the atmosphere of Ozenji Temple in Aso-ku, Kawasaki City conducted by Kawasaki City in 2001, results exceeding environmental standards were obtained. In response to this, Yokohama City also conducted a survey at two locations in the Mishigaoka west district of Aoba-ku, which is close to 2002, and was satisfied with the environmental standards.
Since then, Yokohama City has been conducting dioxin environmental surveys at five locations in Aoba Ward every year to understand the actual atmospheric environment in Aoba Ward, adjacent to Ozenji Temple in Aso Ward, Kawasaki City.
In fiscal 2004, all five locations in Aoba Ward were satisfied with environmental standards.
In fiscal 2005, the program was held at the same location as the previous year in August 2005 and January 2006. I would like to inform you of the results.

2 Survey points

This was done at five locations shown in Table 1.

3 Method of investigation

The survey was sampled and analyzed for one week from August 18 to 25, 2005, and January 26 to February 2, 2006.

4 Survey Results

（１） The annual average value of each point in fiscal 2005 is within the range of 0.044 to 0.069 pg-TEQ / m3, and conforms to environmental standards (0.6 pg-TEQ / m3 or less) at all survey points.

（２） Table 1 shows the results of the survey at each point.

5 Future Responses

Since fiscal 2002, all survey sites in Aoba Ward have met the dioxin environmental standards in the atmosphere and have been able to maintain a favorable atmosphere. In addition, dioxin concentration measurement in the atmosphere in the city is carried out continuously in all 18 wards.

→ (Contact) Green Environment Bureau Environmental Environmental Pollution Monitoring Center Measurement Results of Dioxin concentrations in the atmosphere

(Reference)　Environmental standards for air pollution (atmospheric environmental standards): Annual average value of 0.6 pg-TEQ/m3 or less

pg　：Picogram. One picogram is 1/1 trillion grams.

TEQ： "Toxicity equivalent". A code that indicates that the amount of dioxins is converted to the amount of dioxins, 2,3,7,8-dibenzo-para-dioxin, which is the most toxic among dioxins.

Table 1 Results of a survey of dioxins in the atmosphere in Aoba Ward in FY2005
Survey points	Location:	2005 August 18-25	2006 January 26-February 2	Annual average
Susukino Elementary School, Yokohama City	3-4-1, Susukino, Aoba-ku	0.024	0.11	0.067
Utsukushigaoka Elementary School, Yokohama City	2-29, Utsukushigaoka, Aoba-ku	0.027	0.11	0.069
Yokohama Municipal Iron Elementary School	427, Kuroganecho, Aoba-ku	0.026	0.062	0.044
Azamino Daini Elementary School, Yokohama City	3-29-3, Azamino, Aoba-ku	0.026	0.11	0.068
Yokohama City Utsukushigaokanishi District Center	3-60-15, Utsukushigaokanishi, Aoba-ku	0.022	0.097	0.060

(Unit: pg-TEQ/m3)

[Reference]　Results of a survey of dioxins in the atmosphere in Aoba Ward in fiscal 2004
Survey points	Location:	2004 August 19-26	2005 January 27-February 3	Annual average
Susukino Elementary School, Yokohama City	3-4-1, Susukino, Aoba-ku	0.044	0.073	0.059
Utsukushigaoka Elementary School, Yokohama City	2-29, Utsukushigaoka, Aoba-ku	0.041	0.060	0.051
Yokohama Municipal Iron Elementary School	427, Kuroganecho, Aoba-ku	0.053	0.13	0.092
Azamino Daini Elementary School, Yokohama City	3-29-3, Azamino, Aoba-ku	0.042	0.058	0.050
Yokohama City Utsukushigaokanishi District Center	3-60-15, Utsukushigaokanishi, Aoba-ku	0.040	0.058	0.049

(Unit: pg-TEQ/m3)

[Reference]　Results of a survey of dioxins in the atmosphere in Aoba Ward in fiscal 2003
Survey points	Location:	2003 August 21-28	2004 February 20-27	Annual average
Susukino Elementary School, Yokohama City	3-4-1, Susukino, Aoba-ku	0.050	0.16	0.10
Utsukushigaoka Elementary School, Yokohama City	2-29, Utsukushigaoka, Aoba-ku	0.050	0.069	0.060
Yokohama Municipal Iron Elementary School	427, Kuroganecho, Aoba-ku	0.059	0.084	0.072
Azamino Daini Elementary School, Yokohama City	3-29-3, Azamino, Aoba-ku	0.047	0.071	0.059
Yokohama City Utsukushigaokanishi District Center	3-60-15, Utsukushigaokanishi, Aoba-ku	0.051	0.13	0.090