Table 2.
Distribution of air pollutant levels over 11 days, including each health examination day.
| Air pollutant | n | Mean ± SD | Selected percentiles | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10th | 25th | 50th | 75th | 90th | 95th | |||||||||||
| PM10 (µg/m3) | 1,850 | 42.58 ± 16.81 | 23.08 | 29.92 | 39.94 | 50.75 | 68.12 | 79.51 | ||||||||
| SO2 (ppb) | 1,850 | 3.80 ± 1.45 | 2.43 | 2.72 | 3.27 | 4.35 | 5.99 | 6.94 | ||||||||
| O3 (ppb) | 1,850 | 19.38 ± 7.96 | 8.99 | 11.58 | 19.34 | 26.67 | 29.56 | 31.33 | ||||||||
| NO2 (ppb) | 1,850 | 35.13 ± 8.46 | 24.09 | 28.51 | 35.23 | 39.30 | 45.78 | 48.16 | ||||||||
| Outdoor temperature (°C) | 1,906 | 17.24 ± 8.57 | 3.73 | 11.27 | 18.62 | 24.87 | 26.48 | 26.75 | ||||||||
| Dew point (°C) | 1,906 | 6.78 ± 10.19 | –7.58 | –1.91 | 7.45 | 16.73 | 19.52 | 20.04 | ||||||||
| Exposures to air pollutants and meteorological elements were averaged over the visit day through lag day 10. | ||||||||||||||||