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After peaking, the concentrations dropped with half-lives between 3.5 and 9.3 h but did not reach the initial levels within 18 h again. Compared to pre-training levels, the increase in metabolite excretion was between 546-933 %. During peak excretion reference values for hydroxynaphthalene (35 μg/L, sum of 1- and 2-isomer) and 1-hydroxypyrene (0.30 μg/L) were exceeded in 64 % (maximum 381.3 μg/L) and 73 % of the samples (maximum 1.88 μg/g crea.), respectively. Live fire training is associated with an additional uptake of PAH. Due to the