Table 2.

Distributions of Air Pollutants (μg/m³) in Different Time Periods

PM10 Component	Exposure Period	n	Mean	SD	Median	IQR	Range
PM10_road	T1, daily average	12,445	0.96	0.71	0.80	0.72	0.07–7.80
	T2, daily average	12,726	0.96	0.71	0.80	0.71	0.10–8.37
	T3, daily average	12,670	0.94	0.69	0.78	0.70	0.05–7.26
	Whole pregnancy, daily average	12,315	0.96	0.69	0.81	0.72	0.13–7.72
	0–6 mo, daily average	12,538	0.94	0.68	0.79	0.73	0.14–8.33
	7–12 mo, daily average	12,440	0.89	0.65	0.75	0.68	0.13–7.17
	0–7 yr, annual average	10,974	0.97	0.46	0.93	0.54	0.23–4.78
	8–15 yr, annual average	11,181	0.65	0.28	0.67	0.33	0.13–3.75
	0–15 yr, annual average	10,309	0.80	0.35	0.80	0.41	0.18–3.63
PM10_other	T1, daily average	12,445	5.24	1.97	5.10	2.42	0.78–18.36
	T2, daily average	12,726	5.25	1.96	5.08	2.41	0.79–19.07
	T3, daily average	12,670	5.17	1.94	5.06	2.42	0.86–19.32
	Whole pregnancy, daily average	12,315	5.24	1.85	5.20	2.30	1.12–17.14
	0–6 mo, daily average	12,538	5.19	1.88	5.14	2.37	1.05–19.47
	7–12 mo, daily average	12,440	4.87	1.76	4.83	2.23	1.08–18.07
	0–7 yr, annual average	10,974	4.62	1.35	4.77	1.83	1.30–13.07
	8–15 yr, annual average	11,181	2.70	0.80	2.93	1.04	0.66–6.41
	0–15 yr, annual average	10,309	3.60	1.01	3.78	1.35	0.97–9.39
PM10_total	T1, daily average	12,445	33.45	5.31	32.88	7.90	20.38–54.21
	T2, daily average	12,726	32.97	5.35	31.97	7.86	20.65–56.78
	T3, daily average	12,670	31.49	5.26	30.40	6.87	17.08–67.83
	Whole pregnancy, daily average	12,315	32.58	2.98	32.60	3.79	22.82–48.52
	0–6 mo, daily average	12,538	31.82	3.74	31.57	5.08	22.37–51.76
	7–12 mo, daily average	12,440	30.96	3.12	30.83	4.29	22.51–49.72
	0–7 yr, annual average	10,974	32.99	1.83	33.08	2.50	28.20–42.91
	8–15 yr, annual average	11,181	22.98	1.05	23.19	1.44	20.19–27.25
	0–15 yr, annual average	10,309	27.66	1.36	27.82	1.85	24.03–34.54

Definition of abbreviations: IQR = interquartile range; PM₁₀_other = particulate matter ≤10 μm in aerodynamic diameter from other local combined sources, such as minor roads and industrial or domestic sources; PM₁₀_road = PM₁₀ from local major road traffic; PM₁₀_total = total PM₁₀; T1 = first trimester; T2 = second trimester; T3 = third trimester.