 This study examined the effects of prenatal exposure to sulfur dioxide on the development of attention deficit hyperactivity disorder, ADHD, in children. The results suggest that prenatal exposure to sulfur dioxide may be associated with increased risk of developing ADHD symptoms in children. Furthermore, this study also found that certain genes related to the notch signaling pathway were affected by prenatal exposure to sulfur dioxide, suggesting that these genes may play a role in the development of ADHD. This article was offered by Yoon Jung Choi, Jin Woo Cho, Yoon Chul Hong, and others.