Table 2 Interannual change in arsenic concentrations in seven cities and towns and average concentrations of air-polluting substances in Japan
From: Correlation between the arsenic concentrations in the air and the SMR of lung cancer
Prefecture | Municipalities | Parameters | Measurement period | |||||
|---|---|---|---|---|---|---|---|---|
1974–1978; LP: 25 years | 1979–1983; LP: 20 years | 1984–1988; LP: 15 years | 1989–1993; LP: 10 years | 1994–1998; LP: 5 years | 1999–2003 monitoring surveya | |||
Aomori | Aomori C. | Mean (ng/m3) | 6.3 | 3.5 |
|
|
| 1.01 |
Range of concentrations (min–max) | 2–13 | <1–8 | <0.13–4.0 | |||||
Number of samples | 8 | 64 | 60 | |||||
Shiga | Otsu C. | Mean (ng/m3) | 9.6 | 7.4 |
| 1.34 | ||
Range of concentrations (min–max) | ND–105 | ND–63 | <0.016–4.6 | |||||
Number of samples | 85 | 108 | 86 | |||||
Nagahama C. | Mean (ng/m3) | 4.6 | 2.0 |
| 0.87 | |||
Range of concentrations (min–max) | 1–38 | ND–12 | <0.016–4.2 | |||||
Number of samples | 33 | 28 |
| 61 | ||||
Youkaichi C. | Mean (ng/m3) |
| 1.5 |
| 1.01 | |||
Range of concentrations (min–max) | ND–6 | <0.02–5.2 | ||||||
Number of samples |
| 24 |
| 60 | ||||
Imazu-cho | Mean (ng/m3) | 2.0 | 1.6 | 0.57 | ||||
Range of concentrations (min-max) | ND–10 | ND–9 | <0.014–2.3 | |||||
Number of samples | 23 | 28 |
| 30 | ||||
Oita | Oita C. | Mean (ng/m3) | 3.8 | 2.7 |
| 1.47 | ||
Range of concentrations (min–max) | ND–8 | ND–7 | 0.029–6.3 | |||||
Number of samples | 32 | 41 | 120 | |||||
Saganoseki-cho | Mean (ng/m3) | 26 | 13 | 27 | 13 |
| 25 | |
Range of concentrations (min–max) | 1–170 | 2–31 | 4–150 | <1–28 | 0.12–186 | |||
Number of samples | 18 | 17 | 12 | 19 | 58 | |||
Whole country | SO2 | Mean (ppm) | 0.0200 | 0.0142 | 0.0062 | 0.0058 | 0.0048 | 0.0044 |
NO2 | Mean (ppm) | 0.0198 | 0.0154 | 0.0152 | 0.0172 | 0.0170 | 0.0162 | |
SPM | Mean (mg/m3) | 0.0502 | 0.0412 | 0.0372 | 0.0374 | 0.0344 | 0.0284 | |