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78% of Microplastic Pollution is Created by Tires
(www.pew.org)
edit: mis-read, 78% of microplastics in oceans
Our report found that in 2016, four sources of microplastics alone accounted for 1.3 million metric tons (Mt)—or 11%—of total ocean plastic pollution.
and the wear and tear of car tires, with this final source making up more than three quarters (78%) of microplastic pollution in the ocean
So they make up 78% of the 11% of plastic pollution in the oceans
they account for 28% of microplastics entering the environment globally.