Table 2.
Statistical summary of indoor and outdoor PM2.5 (μg m−3)
| PM2.5 | Indoor | Outdoor | I/O |
|---|---|---|---|
| All | 23.9 ± 16.3 | 76.9 ± 29.0 | 0.31 |
| Classroom | 14.4 ± 5.9 | 0.18 | |
| Reception | 41.1 ± 33.5 | 0.53 | |
| Home | 25.1 ± 5.8 | 0.32 |
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