Comment by kimixa

I also read something saying that roads are one of the biggest sources of microplastics, with tyre wear, and that being next to one (as most suburban houses are) significantly increases the amount in microplastics in foods grown in backyards. I imagine Chickens would be worse as pollutants tend to accumulate as they go up trophic levels.

Though like many discussions about microplastics today, where "higher levels", and what microplastics, cross over into actual health issues is vague.