Swimming is commonly prescribed as therapy for asthmatics and others who suffer from chronic respiratory problems. However, information in the scientific literature also indicates the potential for swimming in chlorinated, indoor pools to increase the incidence of asthma. This behavior, though poorly understood, is generally thought to be attributable to releases of volatile disinfection byproducts (DBPs) from swimming pool water.
In this class, information will be presented to identify the volatile DBPs that are common to pools, as well as information regarding representative concentrations of these compounds and factors that influence this behavior. Limited information will be presented to address the effects of these compounds on human health. The physical processes that are responsible for transfer of these volatile compounds from the liquid phase to the gas phase will also be presented, along with measurements of gas-phase concentrations of trichloramine (NCl 3 ), the compound for which most data are available to describe gas-phase concentrations in chlorinated, indoor pool facilities. Implications of this behavior will be presented in the context of swimming pool facility operations.