Three studies have found that swimmers in indoor pools face a potential health risk from so-called "disinfection byproducts," which are formed when disinfectants such as chlorine react with human sweat, skin cells and urine, according to findings published Sunday in Environmental Health Perspectives. While disinfection byproducts have also been detected in drinking water, indoor pools may be a bigger threat because skin contact allows for greater absorption of the substances, the studies said.

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