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The Spearman’s rank order correlation for 15-min averages of indoor and outdoor PM2.5 levels, outdoor temperature and outdoor humidity.
| Site No. | Indoor/Outdoor PM2.5 Levels | Indoor PM2.5/Temperature | Outdoor PM2.5/Temperature | Indoor PM2.5/Humidity | Outdoor PM2.5/Humidity |
|---|---|---|---|---|---|
| 1 | −0.32 | 0.08 | −0.15 | −0.07 | 0.37 |
| 2 | 0.67 | −0.73 | −0.73 | 0.80 | 0.84 |
| 3 | 0.28 | −0.39 | −0.85 | 0.33 | 0.88 |
| 4 | 0.43 | −0.53 | −0.48 | 0.51 | 0.50 |
Bolded values indicate significance at 95% confidence interval (95% CI).
