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Airborne chemical contaminants within an indoor space have the potential to cause adverse effects on those who work or visit the building. Indoor pools are no exception and airborne contaminants arise when chemicals, used for disinfection purposes, react with the pool water. Pool water can be treated by different means (e.g., chlorination or ultra-violet (UV) radiation) and whether the type of water treatment affects the airborne chemical levels is unclear. This study examined UV-treated vs. chlorine-treated swimming pools to determine if there is a difference in the resulting airborne chemical concentration of chlorine, hydrochloric acid (HCl) and trichloramines.Methods   Two swimming pools (one UV-treated and one chlorine-treated) were selected to participate based upon the inclusion criteria. Partial period sampling was conducted on 3 different days at each facility when swim classes were occurring. For each sampling period, two ambient samples for each analyte (chlorine, HCl, and trichloramines) were collected according to recognized occupational hygiene protocols. Additionally, the temperature and relative humidity were measured, and other pool chemistry information was obtained. Comparative analyses were performed to ascertain if there was a difference in airborne chemical levels between the two pools.Results   Summary statistics indicated very similar averages for each of the three airborne chemicals between the two water treatment types. A two-sample t-test found that the difference in means was not statistically significant for any of the three analytes.Conclusion   There was no statistically significant difference reported in the mean airborne concentration for any of the analytes between the chlorine-treated swimming pool and the UV-treated swimming pool. In addition, all airborne chemical concentration levels were below their respective occupational exposure limit or recommended guideline level. The type of water treatment does not appear to impact the airborne chemical levels though further research is suggested to confirm these results.

Evaluating if airborne chemical levels in indoor swimming pools are influenced by type of water treatment