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In addition, air samples from 17 sports fields in six European countries were analysed. There were no increased concentrations of metals (aluminium, cobalt), PAHs, or other semivolatile substances in air samples, but some volatiles (MIBK 95th percentile 18 μg/m3, benzothiazole 95th perc. 7 μg/m3, tert-butylamine 95th perc. 31 μg/m3, 2-heptanone 95th perc. 0.4 μg/m3, cyclohexanone 95th perc. 1.5 μg/m3, and saturated aliphatic hydrocarbons C9 95th perc. 26 μg/m3) were slightly increased in a few samples. In addition, s