A major study published in the online medical journal: "JAMA Open Network" has confirmed that an increased risk of premature births and low birth weights is significantly associated with exposure to air pollution and excessive heat during pregnancy . Low income communities and Black women specifically were among the most vulnerable group. The peer-reviewed study was based on a review of more than 32 million U.S. births. Chris and Nell of This Green Earth speak with Juanita Constible, a health