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AQI values of the samples. According to the proportion of fine and poor weather, fine weather accounts for two-fifths of the sampling period. Combined with the AQI calculation formula, the AQI values of each sample is shown below.
| Sampling Sites | Beishan | Xueyuan Bridge | Jimen Bridge | Beijing Northern Rail Station | Beijing Western Rail Station |
|---|---|---|---|---|---|
| AQI | 72 | 171 | 172 | 183 | 174 |
