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| China PM2.5 classification standard | ||
| Serial number | PM2.5 Value μg/m³ | Air quality class |
| 1 | 0~35 | excellent |
| 2 | 35~75 | good |
| 3 | 75~115 | Mild pollution |
| 4 | 115~150 | Moderate pollution |
| 5 | 150~250 | Heavy pollution |
| 6 | 250 above | Serious pollution |
| Classification standard of negative oxygen ion in China | ||
| Air quality class | Negative oxygen ion content Unit/cm³ | Air freshness |
| 1 | More than 2000 | Very fresh |
| 2 | 1500 - 2000 | fresh |
| 3 | 1000 ~ 1500 | It is fresh |
| 4 | 500 ~ 1000 | General fresh |
| 5 | Less than500 | Not fresh |
| China PM10 grading standard | ||
| Serial number | PM10 Value μg/m³ | Air quality class |
| 1 | 0~50 | excellent |
| 2 | 50~150 | good |
| 3 | 150~250 | Mild pollution |
| 4 | 250~350 | Moderate pollution |
| 5 | 350~420 | Heavy pollution |
| 6 | 600 above | Serious pollution |