Table 4 Associations between inter-quartile range increases in entire pregnancy average air pollution exposures and preterm birth based on multi-pollutant models.^a

NO LUR_S

1.01 (0.96-1.06)

1.03 (0.98-1.08)

1.03 (0.99-1.08)

1.03 (0.98-1.07)

1.02 (0.97-1.07)

1.02 (0.96-1.09)

1.03 (0.98-1.08)

Ammonium nitrate PM_2.5

1.47 (1.34-1.62)

1.41 (1.29-1.53)

1.38 (1.29-1.48)

1.26 (1.15-1.38)

1.40 (1.31-1.50)

1.51 (1.39-1.64)

1.38 (1.29-1.47)

Ammonium sulfate PM_2.5

0.87 (0.80-0.94)

0.90 (0.84-0.96)

0.91 (0.86-0.96)

0.91 (0.86-0.96)

0.93 (0.87-0.98)

0.83 (0.77-0.90)

0.90 (0.84-0.96)

Geological PM_2.5

0.80 (0.75-0.85)

0.82 (0.77-0.87)

0.80 (0.76-0.85)

0.83 (0.78-0.88)

0.82 (0.77-0.87)

0.80 (0.74-0.87)

0.81 (0.77-0.86)

PM_2.5 vanadium

1.02 (0.97-1.07)

Residual oil PM_2.5

1.02 (0.97-1.07)

CO

1.04 (1.00-1.10)

PM_2.5

1.11 (1.02-1.20)

O₃ (10 am-6 pm)

0.96 (0.90-1.02)

Gasoline PM_2.5

0.95 (0.89-1.01)

Sea salt PM_2.5

1.02 (0.96-1.09)