Table 3.

The effect of maternal exposure to air pollution during whole pregnancy on term birth weight

Air pollutants	Birth weight			TLBW			Macrosomia
	β	95%CI	P	OR	95%CI	P	OR	95%CI	P
AQI	− 2.853	− 3.743, − 1.963	< 0.001	1.029	1.010–1.048	0.003	0.984	0.976–0.993	< 0.001
PM2.5	− 2.739	− 3.693, − 1.785	< 0.001	1.025	1.005–1.045	0.018	0.986	0.977–0.995	0.003
PM10	− 2.458	−3.116, − 1.800	< 0.001	1.035	1.020–1.049	<0.001	0.989	0.983–0.996	0.001
SO2	− 3.982	− 5.511, − 2.453	< 0.001	1.034	1.004–1.065	0.032	0.978	0.963–0.993	0.004
NO2	1.734	0.533, 2.935	0.005	0.991	0.964–1.017	0.476	0.988	0.977–1.000	0.044
CO	− 1.511	− 1.970, − 1.053	< 0.001	1.013	1.004–1.023	0.008	0.992	0.987–0.996	< 0.001
O3	4.531	3.239, 5.823	< 0.001	0.952	0.925–0.980	< 0.001	1.028	1.015–1.040	< 0.001

Note: Above models were all adjusted for maternal age, gestational age, ethnicity, and pregnancy season. Infants with normal term birth weight (≤ 2500 g birth weight and < 4000 g, n = 292192) were used as the control group while assessing the impact of air pollution exposure on the risk of TLBW and macrosomia. AQI means air quality index, which is an important indicator that presents overall air pollution level