In Focus:

Could Smoggy Air Affect a Girl's Periods?

The quality of the air she breathes might have an impact on a teen girl's menstrual cycle, a new study suggests.

U.S. researchers said that exposure to smoggy air could raise teen girls' risk for irregular periods.

"While air pollution exposures have been linked to cardiovascular and pulmonary [lung] disease, this study suggests there may be other systems, such as the reproductive endocrine system, that are affected as well," said lead researcher Dr. Shruthi Mahalingaiah. She's assistant professor of obstetrics and gynecology at Boston University School of Medicine.

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