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Table 2 Pearson correlation coefficients between pairs of period-average concentrations of five air pollutants in 18,835 pregnant women residing in Seoul for 2002–2013 from the Korean National Health Insurance Service–National Sample Cohort

From: Exposure to air pollution during preconceptional and prenatal periods and risk of hypertensive disorders of pregnancy: a retrospective cohort study in Seoul, Korea

Exposure period 12 months 6 months 3 months
PM10
 6 months 0.74
 3 months 0.61 0.8
 1 month 0.5 0.53 0.8
NO2
 6 months 0.77
 3 months 0.62 0.82
 1 month 0.51 0.56 0.82
CO
 6 months 0.69
 3 months 0.53 0.81
 1 month 0.43 0.51 0.85
SO2
 6 months 0.74
 3 months 0.58 0.83
 1 month 0.49 0.56 0.85
O3
 6 months 0.57
 3 months 0.43 0.77
 1 month 0.35 0.43 0.84
  1. PM10 particulate matter, NO2 nitrogen dioxide, CO carbon monoxide, SO2 sulfur dioxide, O3 ozone