Table 2. Air Pollutant Outdoor and Estimated Exposure Measure Concentrations.
| Pollutant | Time Frame | Type of Measurement | Median (Range) | Mean (SD) |
|---|---|---|---|---|
| O3, ppb | 24 h | Outdoor | 19.07 (4.33-47.91) | 21.67 (14.28) |
| Exposure | 4.59 (1.45-19.45) | 6.71 (4.31) | ||
| 2 wk | Outdoor | 21.36 (12.20-34.89) | 22.66 (7.37) | |
| Exposure | 6.95 (4.46-13.28) | 7.84 (2.29) | ||
| PM2.5, µg/m3 | 24 h | Outdoor | 70.33 (16.25-210.70) | 91.20 (53.97) |
| Exposure | 26.64 (3.18-155.01) | 38.69 (30.69) | ||
| 2 wk | Outdoor | 84.43 (56.31-126.88) | 90.25 (23.72) | |
| Exposure | 40.64 (12.98-81.32) | 43.90 (15.08) | ||
| NO2, ppb | 24 h | Outdoor | 28.27 (15.47-47.37) | 28.62 (8.23) |
| Exposure | 22.80 (12.53-39.90) | 23.22 (6.73) | ||
| 2 wk | Outdoor | 30.99 (25.43-39.26) | 31.29 (3.14) | |
| Exposure | 25.20 (20.62-32.13) | 25.48 (2.56) | ||
| SO2, ppb | 24 h | Outdoor | 11.04 (7.41-20.34) | 11.68 (2.95) |
| Exposure | 5.70 (3.71-10.80) | 6.14 (1.63) | ||
| 2 wk | Outdoor | 11.26 (8.22-16.66) | 12.16 (2.99) | |
| Exposure | 6.22 (4.20-9.77) | 6.50 (1.60) |
Abbreviations: NO2, nitrogen dioxide; O3, ozone; PM2.5, particulate matter with a diameter of 2.5 µm or less; ppb, parts per billion; SO2, sulfur dioxide.