Al-eolar breath samplingwas used to asess trihalometne (THM) pg/l. The mean blood levels in the agonistic swimmers were significantly higher than those in the nonagonistic swimmers and the nonswimming observers. Moreover, blood chloroform levels were significantly correlated with water and air concentrations, the number of swimmers in the pool, and the time an individual swimmer spent in the pool. The overall intensity of the physical activity was also correlated with blood chloroform levels. In a follow-up study, Aggazzotti et al. (13) collected alveolar breath samples from swimmers after a 90 min swim session. They found median alveolar breath chloroform at 83 pg/m3 (range 13.9-311 pg/m3), and they determined that postswim chloroform in breath was strongly influenced by environmental air chloroform levels, age, intensity of sporting activity, and the type of swimming.Weisel and Shepard (14) also used exhaled breath measurements to examine chloroform exposures associated with recreational swimming. They found that after a routinized 30-min exposure period, breath elimination of chloroform was rapid, but it could not be fitted to the conventional multicompartment exponential decay models that have been previously used to describe

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