Table 2.

Distribution of ambient air pollution and temperature.

Exposure and window	Mean	SD	Min.	Q1	Median	Q3	Max.
PM2.5 (μg/m3)
Whole pregnancy	22.8	2.9	16.4	20.4	23	24.9	30.3
First trimester	22.8	4.9	12.6	18.8	21.8	26.8	34.3
Second trimester	22.4	5.1	11.5	18	21.3	26.9	32.8
Third trimester	23.2	5.8	11.9	18.1	22.5	28.3	37.5
First year	22.6	2.5	17.6	20.3	23.4	24.6	26.7
First two years	22.4	1.2	20.5	21.6	22.3	23	26.1
First four years	22.5	1	20	21.7	22.2	23.3	26.3
NO2 (ppb)
Whole pregnancy	33.1	5.6	17.8	29	31.9	36.9	49.7
First trimester	33.1	7.7	16.6	27.1	31.1	37.5	60.7
Second trimester	32.8	7.2	20.1	27	31.7	36.9	56.5
Third trimester	33.6	7.6	16.4	27.7	33.1	38.2	63.7
First year	32.7	5.4	17.7	28.6	30.4	37	48.9
First two years	32.4	5.2	17.3	28.5	30.3	36.1	46.9
First four years	32.1	5.2	17	28.4	30	35.6	46.5
Temperature (°C)
Whole pregnancy	15	1.3	11.6	14.2	15	16	18
First trimester	15.2	2	10	13.9	15.3	16.6	19.5
Second trimester	15	2.1	10.1	13.6	14.9	16.6	19.2
Third trimester	14.8	2.2	9.3	13.2	14.7	16.5	20.6
First year	15.1	1.2	11.5	14.2	15.2	16.1	17.8
First two years	15.2	1.2	11.6	14.4	15.2	16.2	17.7
First four years	15.2	1.2	11.5	14.4	15.2	16.2	17.6

Abbreviations: SD, standard deviation; NO₂, nitrogen dioxide; PM_2.5, particulate matter ≤ 2.5 μm in diameter.