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The average concentration of pollutants in the city compared with the same period last year.
| Year | Air quality compliance rate | SO2 (μg/m3) | NO2 (μg/m3) | PM10 (μg/m3) | PM2.5 (μg/m3) | CO (mg/m3) | O3–8 h (μg/m3) | Comprehensive pollution index |
|---|---|---|---|---|---|---|---|---|
| 2021 | 80.80% | 7 | 38 | 74 | 40 | 1.8 | 134 | 4.56 |
| 2022 | 78.10% | 7 | 31 | 72 | 42 | 1.8 | 136 | 4.43 |
| Contrast | −3.30% | – | −18.40% | −2.70% | +5.00% | – | +1.50% | −2.85 |
