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Mean and SD of daily PM2.5 ambient concentrations (μg/m3) and personal exposures (μg/m3) by season.
| PM2.5 concentration |
PM2.5 exposure |
Ratioa | |||
|---|---|---|---|---|---|
| Mean | SD | Mean | SD | Mean | |
| Spring | 14.30 | 7.75 | 7.54 | 3.99 | 0.53 |
| Summer | 17.50 | 9.25 | 10.39 | 5.44 | 0.60 |
| Fall | 13.27 | 7.96 | 5.80 | 3.32 | 0.44 |
| Winter | 15.37 | 7.77 | 8.37 | 4.16 | 0.55 |
Ratio of PM2.5 exposure divided by PM2.5 concentrations and averaged across days.
