Air pollution linked to IVF outcomes in global study
A high-school research intern helped conduct a study examining whether fine particulate air pollution is linked to fertility treatment results across three continents. Earlier research has tied polluted air to poorer semen quality, reduced ovarian reserve, longer time to pregnancy and higher miscarriage risk. The project compared regions with different healthcare systems, fertility practices and pollution levels.
The study tracked PM2.5 — particles 2.5 micrometres or smaller — across Europe, North America and East Asia from 2010 to 2022, drawing on environmental records from the WHO, the European Environment Agency and NASA, alongside public fertility treatment registries. Researchers grouped areas by exposure and compared the most and least polluted quartiles.
In Europe, the most polluted areas showed clinical pregnancy rates 4–8% lower and live birth rates 3–7% lower. North America and East Asia showed gaps of roughly 5–12% and 4–10% respectively. The team included researchers from the Taiwan IVF Group and Ton Yen General Hospital, supervised by Stanford professor emeritus Barry Behr.
Findings like these could inform how fertility clinics counsel patients in heavily polluted regions, and may add pressure on policymakers to consider air quality as a reproductive health issue. People undergoing IVF in smog-prone cities might factor pollution into timing or location decisions, though individual outcomes depend on many clinical variables. Because the analysis relies on regional averages rather than individual exposures, it cannot predict any single patient's result — a limitation worth keeping in mind when interpreting the pattern.