The risk of severe maternal morbidity — serious problems such as needing blood transfusions, hysterectomies or ventilators — are found to be steep, researchers say.
In a study, researchers say the adolescents were 48 percent less likely to experience long-term concussion symptoms when they did the physical activity.
Exposure during the first trimester didn’t increase risk, but the second trimester was associated with the most wildfire-related preterm births, according to the research.