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H. Koi
Osaka Prefectural Environmental Pollution Control Center
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S. Fujita
Environment Bureau, Health and Environment Dept. Osaka Prefectural Government
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I. Aoi
Environment Bureau, Health and Environment Dept. Osaka Prefectural Government
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T. Oinishi
Environment Bureau, Health and Environment Dept. Osaka Prefectural Government
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H. Tanaka
Environment Bureau, Health and Environment Dept. Osaka Prefectural Government