Swimming Pool Water — Chloramine and Trihalomethane Exposure from Chlorine Disinfection Byproducts — outdoor safety profile
Moderate riskSwimming pools maintained with chlorine-based disinfectants generate disinfection byproducts (DBPs) when free chlorine reacts with organic matter — primarily nitrogen-containing compounds from sweat, urine, skin cells, and personal care products.
What is this product?
Swimming pools maintained with chlorine-based disinfectants generate disinfection byproducts (DBPs) when free chlorine reacts with organic matter — primarily nitrogen-containing compounds from sweat, urine, skin cells, and personal care products. The dominant volatile DBP in indoor pools is trichloramine (nitrogen trichloride, NCl3), a potent respiratory irritant responsible for the characteristic 'chlorine pool smell' that is actually the smell of chloramines, not free chlorine itself. Trihalomethanes (THMs), particularly chloroform, form when chlorine reacts with organic carbon and are present in pool water at concentrations of 20-200 micrograms per liter — exceeding EPA drinking water maximum contaminant levels (80 ug/L total THMs) in many pools. Competitive swimmers absorb chloroform both through dermal absorption and inhalation of volatilized THMs above the water surface, with studies showing blood chloroform levels increasing 3-10 fold after a one-hour swim. Epidemiological evidence links childhood swimming in chlorinated pools to increased asthma prevalence (OR 1.7-3.5 for children swimming >1 hour/week before age 7), though causation remains debated.
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Disinfection Byproduct
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