https://www.aamc.org/news/microplastics-are-inside-us-all-what-does-mean-our-health

My take-aways from this article:
There's no good study on microplastics in humans.
They've tested "pristine" plastic on mice and it's pretty bad.
The plastics we're exposed to are loaded with chemicals and toxins.

She carries a stainless-steel water bottle and avoids plastic water bottles. She doesn’t microwave food in plastic containers and only uses glass, wood, or metal kitchen items, including mixing bowls, spoons, cutting boards, and food storage containers.

takes her shoes off to avoid tracking in dust from the outside and uses a HEPA filter to capture particles from the air.

Great point. Tires are one of the leading products polluting our environment and lungs.

This article also links to The Program on Reproductive Health and the Environment at UCSF which offers a guide for minimizing exposure to bad stuff. https://prhe.ucsf.edu/toxic-matters

Here's a relevant NYT Article - How to Minimize Your Exposure to Microplastics