Table 3 The mean PM concentrations and indoor: outdoor ratios (I/O) over the periods in which the monitored bedrooms were unoccupied for a minimum of 24-h.
From: Using low-cost sensors to assess common air pollution sources across multiple residences
Absent period | Average concentration (μg m−3) | Average I/O ratio | ||||
|---|---|---|---|---|---|---|
PM1 | PM2.5 | PM10 | PM1 | PM2.5 | PM10 | |
H1 (1) | 3.03 | 5.06 | 6.86 | 0.02 | 0.06 | 0.34 |
H1 (2) | 2.93 | 5.50 | 7.29 | 0.03 | 0.09 | 0.29 |
H2 | 3.62 | 12.79 | 26.67 | 0.64 | 1.90 | 4.15 |
H3 | 2.78 | 3.77 | 7.34 | 0.08 | 0.21 | 1.46 |
