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| Variable | PM2.5 | PM10 | NO2 | SO2 | CO |
| PM2.5 | 1.00 | 0.55 (0.38−0.62)* | 0.38 (0.29−0.41)* | 0.63 (0.44−0.72)* | 0.71 (0.65−0.97)* |
| PM10 | 1.00 | 0.26 (0.18−0.34)* | 0.41 (0.32−0.68)* | 0.19 (0.06−0.35)* | |
| NO2 | 1.00 | 0.54 (0.48−0.76)* | 0.26 (0.11−0.49)* | ||
| SO2 | 1.00 | 0.33 (0.18−0.66)* | |||
| CO | 1.00 |
Data are presented as Spearman correlation coefficients. *P < 0.01. CO: carbon monoxide; NO2: nitrogen dioxide; PM: particulate matter; SO2: sulphur dioxide.
