Table 2.
Mean, range and interquartile range of criteria air pollutants by exposure window
| Pollutant | Mean | Minimum | Maximum | IQR |
|---|---|---|---|---|
| 3 months preconception | ||||
| PM2.5 (μg/m3) | 11.63 | 4.60 | 22.03 | 5.36 |
| PM10 (μg/m3) | 22.05 | 10.25 | 39.44 | 6.05 |
| NOx (ppb) | 29.02 | 5.09 | 92.97 | 27.00 |
| SO2 (ppb) | 4.06 | 0.80 | 21.00 | 3.46 |
| CO (ppm) | 553.61 | 171.68 | 1125.23 | 260.23 |
| O3 (ppb) | 30.10 | 10.04 | 49.36 | 12.16 |
| First trimester | ||||
| PM2.5 (μg/m3) | 11.68 | 4.63 | 22.00 | 5.13 |
| PM10 (μg/m3) | 21.96 | 10.29 | 38.95 | 6.22 |
| NOx (ppb) | 30.26 | 5.51 | 89.62 | 29.06 |
| SO2 (ppb) | 4.07 | 0.81 | 18.66 | 3.48 |
| CO (ppm) | 561.12 | 179.09 | 1102.43 | 269.82 |
| O3 (ppb) | 29.42 | 10.23 | 48.73 | 12.16 |
| Second trimester | ||||
| PM2.5 (μg/m3) | 11.58 | 4.64 | 21.97 | 4.74 |
| PM10 (μg/m3) | 21.73 | 10.14 | 41.89 | 6.19 |
| NOx (ppb) | 30.13 | 5.76 | 90.65 | 28.98 |
| SO2 (ppb) | 4.00 | 0.81 | 18.98 | 3.27 |
| CO (ppm) | 554.41 | 178.96 | 1103.11 | 269.55 |
| O3 (ppb) | 29.64 | 10.33 | 49.52 | 11.86 |
| Whole pregnancy | ||||
| PM2.5 (μg/m3) | 11.63 | 5.73 | 19.64 | 4.58 |
| PM10 (μg/m3) | 21.89 | 10.73 | 39.74 | 4.32 |
| NOx (ppb) | 29.80 | 6.38 | 81.64 | 22.47 |
| SO2 (ppb) | 4.01 | 0.96 | 15.83 | 3.04 |
| CO (ppm) | 551.17 | 224.90 | 1045.57 | 210.98 |
| O3 (ppb) | 29.73 | 13.64 | 46.38 | 7.78 |