ECHA: PAHs in rubber granules to face further EU restriction

All-weather sports pitches using rubber granules for durability and shock absorption will face further EU restrictions due to potential threats from the polycyclic aromatic hydrocarbons (PAHs) within, according to the European Chemicals Agency (ECHA).

The granules and mulches are often made from end-of-life tyres (ELTs) that are broken up and ground into smaller pieces. Their use as infill in synthetic turf has increased in the last 10-15 years due to because the increase on the number of synthetic turfs and also due to the prohibition on landfilling scrap tyres in the EU. 

The granules may also release volatile and semi-volatile organic hydrocarbons (VOCs and SVOCs). The granules also contribute to microplastic pollution as they can be spread to the environment from the pitches, for example, through rainwater or players’ footwear and clothing. 

The EU is taking action to improve the environmental footprint of the pitches and to protect its citizens from hazardous chemicals found in the infill material. 

ECHA assessed the health risks, looking at exposure through skin contact, ingestion and inhalation. The findings were published in February 2017, with ECHA concluding that there was a very low level of concern from exposure to the granules. The risk of cancer after a lifetime exposure to rubber granules was judged to be very low based on the concentrations of PAHs measured at some European sports grounds. These concentrations were well below the legal limits. Also, the presence of heavy metals, phthalates, benzothiazole and methyl isobutyl ketone were below concentrations that would lead to health problems. The findings noted that, where the rubber granules were used indoors, the volatile organic compounds released might lead to skin and eye irritation.

In July 2018, the Dutch authority RIVM proposed a restriction to limit the concentration of eight PAHs in granules or mulches used as infill material in synthetic turf pitches or in loose form for use in sports applications and on playgrounds.

The Dutch authorities recommended to lower the combined concentration limit for the eight PAHs to 17 mg/kg.

In May 2021, ECHA published a follow-up study on substances (other than PAHs) in plastic and rubber granules and mulches used as infill on artificial pitches. It identified over 300 chemicals that could potentially be found in the infill material and created criteria to prioritise those that potentially pose the greatest concern.