In 2016, doubts were raised about whether the rubber granules in the fields involved health risks. The rubber granules predominantly consist of grinded (car) tires. It has been determined that one football field contains about 120 tons of rubber granules. This is a substantial amount, because it equals about 20,000 (car)tires. The alleged problem with the rubber granules is that they may contain carcinogenic substances, including “polycyclic aromatic hydrocarbons” (PAHs).