Boulet SL, et al. - Researchers examined how air pollution influence IVF treatment outcomes in the USA. They conducted a retrospective cohort study of 253,528 non-canceled fresh, autologous IVF cycles including 230,243 fresh, autologous IVF cycles with a transfer of ≥ 1 embryo between 2010 and 2012. Linking up of 2010–2012 National ART Surveillance System data for fresh, autologous IVF cycles was done with the ambient air pollution data generated using a Bayesian fusion model available through the Centers for Disease Control and Prevention’s Environmental Public Health Tracking Network. The analysis yielded no clear evidence supporting a meaningful association between reproductive outcomes and average daily concentrations of particulate matter with an aerodynamic diameter of ≤ 2.5 μm and ozone.