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Tire Dust Makes Up the Majority of Ocean Microplastics, Study Finds
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this post was submitted on 01 Oct 2023
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The link you provided has synthetic clothing at 35% and tire dust at 28%.
The next two biggest categories are city dust and road markings.
It's not really that much of a shocker that a different study finds tire dust as the biggest category.
Fishing nets have never been a big contributor to microplastics. They are a big category of hazardous ocean waste.
https://www.theguardian.com/environment/2019/nov/06/dumped-fishing-gear-is-biggest-plastic-polluter-in-ocean-finds-report
Read the first sentence: "Lost and abandoned fishing gear which is deadly to marine life makes up the majority of large plastic pollution in the oceans, according to a report by Greenpeace." I added the italics. Note also that the OP article is about micro plastics.
Fishing nets don't photodegrade into microplastics?