Wildfire smoke is now the primary pollutant affecting pregnancy, study shows

A study analyzing data from 2003 to 2019 found that wildfire smoke has become the primary pollutant affecting pregnancies in the U.S., contributing to risks like low birth weight and preterm births. While pollution from cars and industry has declined, increasing wildfire smoke has offset these gains, with 65% of pollution days exceeding national standards attributed to wildfires.