Table 3. The mass ratio of secondary inorganic aerosols (SIA) to water-soluble (WSI) and PM2.5 concentration during the sampling periods.
| Seasons | Sampling Sites | SIA/WSI (%) | SIA/PM2.5(%) | Seasons | SIA/WSI (%) | SIA/PM2.5(%) |
|---|---|---|---|---|---|---|
| Summer | XM | 63.6 | 23.0 | Winter | 78.7 | 39.0 |
| FZ | 56.6 | 24.5 | 77.2 | 33.5 | ||
| PH | 61.3 | 24.0 | 75.3 | 33.5 | ||
| TP | 60.0 | 29.5 | 75.7 | 31.3 | ||
| TC | 64.4 | 28.5 | 81.3 | 38.9 | ||
| KH | 59.3 | 24.7 | 70.4 | 29.7 | ||
| Fall | XM | 75.2 | 35.2 | Spring | 82.6 | 34.2 |
| FZ | 65.7 | 30.2 | 83.0 | 37.3 | ||
| PH | 74.0 | 30.8 | 78.6 | 35.9 | ||
| TP | 74.1 | 33.9 | 73.6 | 32.4 | ||
| TC | 75.8 | 31.8 | 74.2 | 32.8 | ||
| KH | 75.5 | 34.1 | 67.2 | 31.9 |
Secondary Inorganic Aerosols (SIA) = NO3− + SO42−+ NH4+; WSI: Water-soluble Ions.