Condition Consequence
High physical effort The internal dose of THMs increases significantly with intensity of physical activity (101). The content of THMs in swimmers’ blood is correlated with their content in the ambient air, and not in the water, of swimming-pools (102)
Stronger impact of the inhalation route compared to ingestion or dermal absorption
Oral inhalation of water droplets Increases the amount of exposure and may also alter the lung microbiome
Greater swimming skills Lower rate of ingestion in a comparable time than for less skilled users