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Significance Preeclampsia is a pregnancy-induced hypertensive disorder and is a leading cause of maternal mortality and morbidity worldwide. It is associated with adverse pregnancy outcomes such as perinatal death, preterm [...], Objectives Air pollution exposure may contribute to the development of preeclampsia and hypertension during pregnancy. However, the evidence for such a relation is still limited. We investigated the associations between exposure for moderate to low levels of air pollution during pregnancy and preeclampsia and gestational hypertension in selected urban and county areas of Norway. Methods This study used a sub-group of 17,533 women in the Norwegian Mother and Child Cohort Study. Air pollution levels at residential addresses were estimated using land use regression models and back-extrapolated to the period of each pregnancy. Information on preeclampsia and gestational hypertension were obtained from the Medical Birth Registry of Norway and information on lifestyle factors was collected from questionnaires completed by the women during pregnancy. Results Moderate mean levels of N[O.sub.2] (13.6 [+ or -] 6.9 [micro]g/[m.sup.3]) at residential address during pregnancy were not associated with preeclampsia and pregnancy hypertension. We found no statistically significant associations per 10 |g/[m.sup.3] change in N[O.sub.2] exposure and preeclampsia (adjusted OR 0.89, 95% CI 0.74, 1.08) or hypertension during pregnancy (adjusted OR 0.91, 95% CI 0.78, 1.06). Conclusions for Practice In this large Norwegian pregnancy cohort, we found no statistically significant associations for moderate to low levels of pregnancy N[O.sub.2] exposure and preeclampsia or hypertension during pregnancy. Keywords Air pollution * N[O.sub.2] * Preeclampsia * Pregnancy hypertension * The Norwegian Mother and Child Cohort Study