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Halogen derivatives of hydrocarbons - trihalomethanes (THMs), are formed in disinfected swimming pool waterпїЅ mostly when chlorine compounds are used for the process. THMs have a negative impact on human health because they are carcinogenic and mutagenic. In Poland, the contents of THMs in swimming pool water and air are standardized, the norm for swimming pool water is 100 g/dm3. Several factors can influence the THMs formation in water, but most important are processes and chemicals used for water treatment. Th...