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Pearson’s correlation between different PM sizes during workdays (a) and holidays (b).
| PM1 | PM2.5 | PM4 | PM10 | Total PM | (a) |
| 1 | 0.999 | 0.995 | 0.934 | 0.660 | PM1 |
| 1 | 0.997 | 0.943 | 0.668 | PM2.5 | |
| 1 | 0.959 | 0.686 | PM4 | ||
| 1 | 0.740 | PM10 | |||
| 1 | Total PM | ||||
| PM1 | PM2.5 | PM4 | PM10 | Total PM | (b) |
| 1 | 0.999 | 0.994 | 0.913 | 0.686 | PM1 |
| 1 | 0.996 | 0.922 | 0.692 | PM2.5 | |
| 1 | 0.946 | 0.705 | PM4 | ||
| 1 | 0.740 | PM10 | |||
| 1 | Total PM |
