We modeled a linear function of air pollutants and the ORs for each congenital heart defect group. We present the estimated ORs for continuous increase of 5 μg/ m3 PM2.5, 10 μg/m3 of PM10, 10 ppb of NO2, 1 ppb of SO2, 5 ppb of O3, 1 ppm of CO, along with their 95% CI in Table 3 and 4