“…Namely, the used stabilizers, process oils, accelerators, activators, pigments, fillers, and flame retardants may pose a risk for human health according to recent knowledge [ 4 ]. Major concerns are related particularly to polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), and heavy metals [ 5 , 15 , 16 , 17 ]. Moreover, the standards dealing with safety requirements for playgrounds and leisure times activities do not sufficiently reduce the risk associated with the use of these areas and only slightly reduce the concentration of pollutants, especially polycyclic aromatic hydrocarbons, which are considered as carcinogenic or mutagenic [ 18 ].…”