Research Article
Human Settlement Quality Evaluation Based on Air Quality in Major Cities of China
| Ratings | Level I | Level II | Level III | Level IV | Level V |
| Index (I) | 0.69 ≤ I ≤ 0.89 | 0.6 ≤ I ≤ 0.69 | 0.45 ≤ I ≤ 0.6 | 0.3 ≤ I ≤ 0.45 | 0.1 ≤ I ≤ 0.3 | Condition | A | B/C | D | E | F |
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