They appear as black granules, with the distinctive smell and colour of tyres from which they originate: this is recycled rubber from ELTs. It is precisely because of its smell and colour that such material is often perceived as something suspicious, dirty or even dangerous. The environment where this rubber is used – in most cases – also contributes to generate more doubts on its healthiness: is a material designed to roll on roads suitable to be used as infill in football fields?     Today, artificial turfs are made of carpets of synthetic grass blades (PE or PP) from 5 to 12 cm long, kept upright by a variety of sand infill and elastic granules, including recycled rubber from ELTs. It is thanks to the presence of ELT rubber – in the past only sand was used – th...