I think that the main source is motor vehicles, both cars, trucks and heavy duty trucks and maybe motorcycles if you have enough of them (which we do not in Nor

I think that the main source is motor vehicles, both cars, trucks and heavy duty trucks and maybe motorcycles if you have enough of them (which we do not in North America.) https://www.plasticstoday.com/medical/tire-wear-major-source-microplastics-say-researchers https://www.plasticstoday.com/medical/tire-wear-major-source...