Table 2.
Descriptive statistics of three-day moving averages of urban air pollution data: Jan 1, 2005 - Dec 14, 2013.
| Pollutant (units) | N1 | Mean | SD | 25th Pctl | 50th Pctl | 75th Pctl | Maximum | IQR2 | |
|---|---|---|---|---|---|---|---|---|---|
| 1-hr max CO | (ppm) | 3284 | 0.6 | 0.4 | 0.4 | 0.5 | 0.7 | 3.7 | 0.4 |
| 1-hr max NO2 | (ppb) | 3287 | 34.4 | 11.1 | 26.3 | 33.6 | 41.7 | 77.8 | 15.3 |
| 8-hr max O3 | (ppb) | 3287 | 41.9 | 15.7 | 29.4 | 40.5 | 53.0 | 95.6 | 23.6 |
| 1-hr max SO2 | (ppb) | 3287 | 10.9 | 9.7 | 3.3 | 8.0 | 16.0 | 57.1 | 12.7 |
| 24-hr PM2.5 | (ug/m3) | 3287 | 12.5 | 5.6 | 8.6 | 11.4 | 15.3 | 45.0 | 6.7 |
| 24-hr SO42- | (ug/m3) | 3281 | 3.2 | 2.2 | 1.8 | 2.5 | 3.9 | 20.1 | 2.2 |
| 24-hr EC | (ug/m3) | 3228 | 1.0 | 0.6 | 0.6 | 0.9 | 1.2 | 5.4 | 0.6 |
| 24-hr OC | (ug/m3) | 3222 | 3.2 | 1.3 | 2.3 | 2.9 | 3.8 | 13.6 | 1.5 |
1
ED data for the last sixteen days of 2013 is missing