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Summary statistics for PM2.5 concentrations in each microenvironment.
| Microenvironment | n | Average Fraction of a Day Spent | PM2.5 (μg/m3) | |
|---|---|---|---|---|
| Mean | SD | |||
| Home | 132,382 | 75% | 14.98 | 103.92 |
| Work/School | 16,534 | 9% | 7.89 | 33.84 |
| In-transit | 8,347 | 5% | 3.66 | 9.77 |
| Other place | 18,489 | 11% | 35.37 | 181.14 |
