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. Author manuscript; available in PMC: 2015 Aug 18.
Published in final edited form as: Environ Res. 2013 Mar 21;123:9–16. doi: 10.1016/j.envres.2013.01.006

Table 2.

Trimester-Specific Distributions of Ambient Air Pollutants and Correlations among Pollutants

Exposure mean ±SD Correlations*
NO2 O3 PM10 PM2.5
1st Trimester
    CO (ppm) 0.58± 0.47 0.86 − 0.64 0.36 0.77
    NO2 (ppb) 28.63± 7.1 − 0.72 0.43 0.74
    O3 (ppb) 21.5± 7.4 − 0.03 − 0.45
    PM10 (µg/m3) 34.5 ± 6.0 0.53
    PM2.5 (µg/m3) 17 ± 3.5
2nd Trimester
    CO (ppm) 0.67± 0.50 0.84 − 0.57 0.37 0.76
    NO2 (ppb) 30 ±6.9 − 0.74 0.44 0.80
    O3 (ppb) 18.2± 6.8 0.01 − 0.53
    PM10 (µg/m3) 34.9 ± 6.3 0.52
    PM2.5 (µg/m3) 17.5 ± 3.5
3rd Trimester
    CO (ppm) 0.62 ±0.55 0.87 − 0.66 0.54 0.79
    NO2 (ppb) 30± 7.9 − 0.78 0.61 0.81
    O3 (ppb) 18.2± 8.1 − 0.18 − 0.55
    PM10 (µg/m3) 35.1 ± 7.2 0.68
    PM2.5 (µg/m3) 18.1 ± 5.0
*

Values obtained by Pearson’s correlation test.