A study led by the University of Washington reveals a significant link between exposure to wildfire smoke and an increased likelihood of preterm birth among pregnant individuals. Analyzing data from more than 20,000 births between 2006 and 2020, researchers found that exposure to fine particulate matter (PM2.5) from wildfire smoke heightens the risk of giving birth before 37 weeks, a condition affecting approximately 10% of American babies. The risk was notably higher during the second trimester, particularly around the 21st week of gestation. In regions like the Western U.S., where wildfire smoke exposure is more intense, the correlation was strongest. The study suggests that tiny smoke particles could interfere with placental health, impacting fetal development. Researchers advocate for targeted public health messaging to support pregnant individuals during smoke events, emphasizing the need for further investigation into the mechanisms behind this association. The findings, published in The Lancet Planetary Health, underscore the urgent need for measures to protect maternal and infant health amidst rising air pollution from wildfires.