Table 2 Summary of Ambient Air Pollution Exposure Levels During 3-month Preconception period, first trimester, second trimester, third trimester of pregnancy and the entire pregnancy period, unit: μg/m3
Time point | NO2 | PM2.5 | ||
|---|---|---|---|---|
Mean (SD) | Median (Q1 – Q3) | Mean | Median (Q1 – Q3) | |
Preconception | 42.1 (9.9) | 41.6 (34.1, 49.5) | 38.3 (8.5) | 37.9 (30.6, 45.0) |
First Trimester | 42.9 (10.8) | 43.0 (34.5, 51.1) | 38.9 (9.3) | 38.9 (30.9, 46.8) |
Second Trimester | 42.0 (10.9) | 41.3 (33.6, 50.2) | 37.6 (9.0) | 36.9 (30.3, 44.8) |
Third Trimester | 41.5 (12.5) | 39.8 (31.3, 50.2) | 36.2 (10.4) | 35.4 (27.4, 44.2) |
Whole pregnancy | 42.8 (11.5) | 41.4 (33.1, 50.5) | 37.5 (9.6) | 37.6 (29.5, 45.5) |