Table 2.
Means and standard deviations of short-term1 and long-term2 near-roadway and regional air pollution exposure levels among 173 adolescents and young adults enrolled from the Southern California Children’s Health Study during year 2014–2018.
| Mean | Standard Deviation | |
|---|---|---|
| Short-term Exposures | ||
| Near-roadway air pollutants (NRAP) | ||
| Freeway NRAP (ppb)3 | 4.8 | 6. 3 |
| Non-freeway NRAP (ppb)3 | 1.5 | 1.0 |
| Total NRAP (ppb)3 | 6.3 | 6.6 |
| Regional air pollutants | ||
| NO2 (ppb)3 | 15.4 | 5. 9 |
| O3 (ppb)3 | 48.3 | 14.3 |
| PM10 (μg/m3) | 29.5 | 10.2 |
| PM2.5 (μg/m3) | 12.0 | 4.4 |
| Long-term Exposures | ||
| Near-roadway air pollutants (NRAP) | ||
| Freeway NRAP (ppb)3 | 5.1 | 6. 2 |
| Non-freeway NRAP (ppb)3 | 1.5 | 1.0 |
| Total NRAP (ppb)3 | 6.6 | 6.6 |
| Regional air pollutants | ||
| NO2 (ppb)3 | 15.7 | 4. 0 |
| O3 (ppb)3 | 48.2 | 6.4 |
| PM10 (μg/m3) | 30.2 | 7.3 |
| PM2.5 (μg/m3) | 12.0 | 2.6 |
1.
Short-term air pollution exposure was estimated from the individual residential history for lagged 1-month exposure level prior to the study visit.
2.
Long-term air pollution exposure was estimated from the individual residential history for lagged 1-year exposure level prior to the study visit.
3.
ppb: parts per billion, as the unit of NRAP, NO2 and O3 exposure