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| Title | 図4-1-2 二酸化窒素濃度の年平均値の推移(昭和45年度~平成26年度) | 
|---|---|
| URL | https://www.env.go.jp/policy/hakusyo/h28/excel/fd2_4_1_02.xls | 
| Description | |
| Format | XLS | 
| File Size | 32,768 | 
| Last Modified Date | October 23, 2025 | 
| License | CC BY | 
| Copyright | |
| Language | ja |