TABLE 2.
DESCRIPTIVE STATISTICS FOR AIR POLLUTANTS USED TO ESTIMATE LONG-TERM EXPOSURES AT PARTICIPANTS’ RESIDENCES IN THE CALIFORNIA TEACHERS STUDY, JUNE 1996–DECEMBER 2005*
| Pollutant | Units | Mean (SD) | IQR | Min–Max |
| Ozone | ppb | 48.11 (8.72) | 11.02 | 25.39–82.63 |
| PM2.5* | μg/m3 | 15.64 (4.48) | 8.02 | 3.11–28.35 |
| PM10 | μg/m3 | 29.21 (9.73) | 15.05 | 9.19–82.64 |
| NO2 | ppb | 33.59 (9.63) | 10.29 | 5.24–67.19 |
| NOx | ppb | 95.60 (34.5) | 48.31 | 7.31–221.4 |
| SO2 | ppb | 1.72 (0.62) | 0.43 | 0.21–3.65 |
| CO | ppm | 1.05 (0.36) | 0.49 | 0.28–3.34 |
Definition of abbreviations: IQR = interquartile range; NOx = nitrogen oxides; PM2.5 = particulate matter less than 2.5 μm in aerodynamic diameter; PM10 = particulate matter less than 10 μm in aerodynamic diameter.
*
PM2.5 data were limited to the period March 1999–December 2005.