Breast cancer is one of the most common malignancies and the second leading cause of death in women. Despite efforts for its early detection, its worldwide incidence continues to increase (DeSantis et al., 2019). Thus, identification of risk factors for its development and new targets for its therapy are of vital importance. Different environmental pollutants, known as EDC, have hormonal effects that canaffect human health and disrupt endocrine functions; these EDCs derived from human activity have been associated with predisposition to the development of cancer. (Diamanti-Kandarakis et al., 2009). Di-isobutyl-phthalate (DIBP) and Bis-(2-ethylhexyl)-phthalate (DEHP) are able to bind to estrogen receptors (ER) located in the nucleus (ERα) and in the membrane (ERβ). The FDA has estimated that the adult population in the US could be exposed to 0.185 µg / kg body weight / day, while the child population to 2.42 µg / kg body weight / day. Despite there are no studies in the Latin American population, including the Mexican, previous studies in Mexico have shown that these types of compounds are present in particles smaller than 2.5 µm in the northeast area of Mexico City, mainly in February, where a DEHP concentration was observed between 9 to 75 ng / m³ (Valtierra-Medina, et al., 2010).