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Table 2 Pollutant distributions for entire pregnancy averages.

From: Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles county, California

 

Pollutanta

n

Mean

IQRb

SDc

 

NO

112915

27.3

7.5

7.5

LUR_U d

NO2

112915

25.2

4.2

3.6

 

NOx

112915

52.8

11.6

10.5

 

NO

86505

29.4

14.5

11.1

LUR_S e

NO2

86505

26.7

5.6

4.4

 

NOx

86505

56.7

19.8

14.9

 

Naphthalene

15006

181.7

52.2

34.6

 

Benzo(a)pyrene

15006

0.13

0.06

0.05

 

Benzo(g, h, i)perylene

15006

0.32

0.14

0.08

 

Total PAHs

15006

221.4

59.3

38.6

 

Benzene

61105

0.66

0.20

0.16

 

TSP V

64224

10.5

5.1

5.6

 

PM2.5 V

64095

7.5

3.5

4.1

 

PM10 OC

64084

5.5

0.99

0.72

Air toxics

PM10 EC

64084

2.2

0.55

0.37

 

PM25 OC

64055

7.4

1.3

0.95

 

PM25 EC

64055

1.9

0.55

0.38

 

Ammonium nitrate PM2.5

69936

6.2

1.8

1.1

 

Ammonium sulfate PM2.5

69936

5.3

1.8

1.2

 

Biomass burning PM2.5

69677

0.27

0.15

0.11

 

Diesel PM2.5

69782

3.1

0.99

0.70

 

Gasoline PM2.5

44691

1.3

0.71

0.44

 

Geological PM2.5

66380

1.2

0.64

0.44

 

Meat cooking PM2.5

55570

1.7

0.69

0.50

 

Residual Oil PM2.5

69936

0.54

0.23

0.27

 

Sea Salt PM2.5

69936

1.5

0.45

0.31

 

CO

87815

0.84

0.38

0.27

 

NO

87424

41.1

19.8

13.7

 

NO2

87424

29.3

4.3

3.2

Criteria

NOx

87424

70.3

22.8

15.7

pollutants

O3

87815

34.5

8.2

5.8

 

PM10

55687

31.4

5.8

3.7

 

PM2.5

92865

18.0

2.6

2.1

  1. a Pollutant values are expressed in the following units: NO, NO2, NOx, O3, Benzene, ppb; B(a)P, PAHs, TSP V, PM2.5 V, ng/m3; PM10, PM2.5, PM10 OC, PM10 EC, PM2.5 OC, PM2.5 EC, μg/m3; CMB estimates for source contributions to PM2.5, μg/m3; CO, ppm.
  2. b Interquartile range.
  3. c Standard deviation.
  4. d Unseasonalized LUR model estimates.
  5. e Seasonalized LUR model estimates.