PM | 24-hour PM concentrations (μg∙m−3) | |||||
Scholar sites | Peripheral district sites | Industrial sites | Roadside sites | Administrative sites | Recommended limits | |
PM1 | 6 ± 1 | 12 ± 3 | 14 ± 6 | 14 ± 4 | 13 ± 5 | - |
PM2.5 | 6 ± 1 | 24 ± 5 | 29 ± 14 | 25 ± 5 | 25 ± 9 | 25a, 35b |
PM10 | 23 ± 11 | 281 ± 154 | 263 ± 156 | 195 ± 77 | 171 ± 95 | 50a,c, 150b |