Tools, gummiskrapor, exercise equipment, strollers, bicycles and scooters.Some contain carcinogenic substances, indicates a review of the Swedish chemicals agency.the Purpose of the sampling was to verify the presence of polycyclic aromatic hydrocarbons (PAHS), a group of substances that can be carcinogenic. PAHS are actually a waste product from the petroleum in making plastics or synthetic rubber, says Camilla Westlund, inspector at the Swedish chemicals agency.the Substances are colorless, but are available in, including black soot, why the inspection focused on the soft products of black rubber or plastic.In the survey included 58 products) and five of these found prohibited PAHS and in all the other detected PAHS that have not yet been discharged, but where the suspicion of carcinogenic properties.