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The antioxidant and antiozonant is found in all tyres today because it stabilises them and reduces cracking, but scientific research published in 2020 found the chemical was to blame for mass deaths of Coho salmon off the U.S.

While critics say tyres contain many toxic and carcinogenic chemicals, so far there is only really consensus around one - 6PPD, an antioxidant and antiozonant found in all tyres that reduces cracking.