A groundbreaking study by researchers at All India Institute of Medical Sciences (AIIMS Delhi) has revealed that air pollution can damage the placenta, restrict fetal growth, and increase pregnancy complications, with effects that may extend well beyond birth.
The research, published in EMBO Molecular Medicine and funded by ICMR, examined how urban air pollution impacts pregnancy using laboratory experiments, animal models, and human pregnancy data. Scientists discovered that fine particulate matter, particularly PM2.5 and PM10, can cross the placental barrier and trigger inflammation and oxidative stress in the placenta.
Pollution particles interfere with the placenta’s critical ability to deliver oxygen and nutrients to the developing fetus by affecting blood vessel formation, nutrient transport, and healthy fetal growth. The study found that increased exposure to PM2.5 was linked to higher risks of low birth weight and preeclampsia, a serious pregnancy complication marked by high blood pressure.
Corresponding author Subhradip Karmakar, Professor of Biochemistry at AIIMS Delhi, explained that pollution particles breach the placental barrier and influence genes responsible for fetal growth. The team discovered toxic metals, including lead, cadmium, and antimony, accumulating in placental tissue, suggesting pollutants can reach the fetus and potentially influence growth and neurodevelopment.
One of the most significant findings involved IGFBP3, a gene crucial for fetal development that gets suppressed by pollution-induced inflammation. This suppression disrupts placental development and affects healthy fetal growth, potentially explaining why pollution exposure connects to poorer birth outcomes.
Animal study results showed striking outcomes: smaller litter sizes reduced by up to 25 percent, abnormal placental development, reduced birth weight by about 34 percent at term compared to controls, and slower growth in offspring. Researchers also observed behavioral and developmental changes in offspring after birth, including impaired motor coordination, heightened anxiety-like behavior, and altered stress responses.
The findings add to growing evidence that air pollution poses serious risks beyond respiratory and cardiovascular diseases, threatening maternal and child health. Researchers cautioned that the full scope of long-term impacts, including potential effects on motor development, cognitive function, cardiovascular health, cancer risk, and metabolic disorders, requires further transgenerational studies.
The team suggested immediate practical measures, such as pregnant women using masks in highly polluted areas and consuming antioxidant-rich diets as interim protections, while stressing that systemic pollution control remains essential. They recommended that pollution monitoring should be integrated into prenatal care.
