There is strong evidence that BPA is both an ovarian and uterine toxicant. This has been show in multiple studies where high levels of BPA were found in women undergoing in vitro fertilization or IVF. This has translated to lesser successful pregnancies. More recently, a study of 239 women was conducted to show how the environmental pollution of BPA affects fertility in women. The result of this study showed that 17% of the women, with high level exposure to BPA, had a baby. This compared to 54% of women who had the lowest exposure to this environmental pollutant. Another research study of 174 women undergoing IVF in Boston, showed high concentrations of BPA in urine. This high level of this toxic chemical in urine has been linked to reduction in cells that form eggs in ovaries. Women with higher BPA levels had 24% fewer cells than than those with lower levels. Also pollution by BPA has been linked with reduced estrogen activities in women and embryo quality.