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The annual average PM2.5, NO2, SO2, CO and O3 concentrations of 32 stations in Beijing in 2018, 2019, and 2020.
| Year | PM2.5 (μg m−3) | NO2 (μg m−3) | SO2 (μg m−3) | CO (mg m−3) | O3 (μg m−3) |
|---|---|---|---|---|---|
| 2018 | 52.06 | 41.02 | 5.95 | 0.81 | 60.39 |
| 2019 | 42.78 | 36.45 | 4.55 | 0.70 | 60.88 |
| 2020 | 38.13 | 29.82 | 3.70 | 0.64 | 59.80 |
