Learn about microplastics

Start here. These guides cover the fundamentals — grounded in published research, with careful language about what science does and doesn't yet know.

Guide · 5 min read

What Are Microplastics? A Plain-English Guide

Microplastics are plastic particles smaller than 5 millimeters. Here's where the definition comes from, the difference between primary and secondary microplastics, and why particle size matters.

Guide · 5 min read

Microplastics and Health: What the Research Actually Says

A careful look at the evidence on microplastics and human health — what has been found in the body, what studies suggest about potential harm, and where the science is still uncertain.

Guide · 5 min read

Where Microplastics Come From: The Major Sources

Synthetic textiles, tire wear, packaging, bottled water, tea bags, cosmetics, and more — a tour of the main sources of microplastics and which ones matter most for everyday exposure.