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Table 2 Ambient pollutant concentrations over four prenatal averaging periods

From: Prenatal ambient air pollution and maternal depression at 12 months postpartum in the MADRES pregnancy cohort

Pollutant

1st trimester

2nd trimester

3rd trimester

Pregnancy average

Mean

SD

Mean

SD

Mean

SD

Mean

SD

NO2(ppb)

16.2

5.9

17.4

5.2

17.4

5.7

17.0

2.7

O3(ppb)

27.3

6.2

25.7

5.9

25.4

6.8

26.1

2.7

PM2.5(μg/m3)

12.3

2.0

12.4

2.0

12.1

2.7

12.2

1.1

PM10(μg/m3)

31.2

5.1

31.0

5.9

30.0

6.1

30.8

3.7