> About 34% of the emitted coarse TWPs (tire wear particles) and 30% of the emitted coarse BWPs (brake wear particles) (100 kt yr−1 and 40 kt yr−1 respectively) were deposited in the World Ocean. These amounts are of similar magnitude as the total estimated direct and riverine transport of TWPs and fibres to the ocean (64 kt yr−1).
> Seventy-eight percent of ocean microplastics are synthetic tire rubber, according to one estimate.
https://e360.yale.edu/features/tire-pollution-toxic-chemical...
> About 34% of the emitted coarse TWPs (tire wear particles) and 30% of the emitted coarse BWPs (brake wear particles) (100 kt yr−1 and 40 kt yr−1 respectively) were deposited in the World Ocean. These amounts are of similar magnitude as the total estimated direct and riverine transport of TWPs and fibres to the ocean (64 kt yr−1).
https://www.nature.com/articles/s41467-020-17201-9