Heavy metals like lead, mercury, arsenic, and cadmium can be toxic at low levels and persist in the environment. They show up in older plumbing and paint, some fish, groundwater, and contaminated soil. Here’s what they are, where they come from, and how to reduce exposure.

Persistent organic pollutants (POPs) are toxic chemicals that last a long time in the environment, build up in living things, and can travel long distances. Many of the original ones are now banned, but they still linger. Here’s a clear look at what they are, why they matter, and what’s been done about them.

“Forever chemicals” is the nickname for a group of human-made substances that resist breaking down in the environment and in our bodies. Most often it refers to PFAS. Here’s a clear look at what the term actually means, where these chemicals show up, and what practical steps can lower exposure.

PFAS are a large group of human-made chemicals that resist heat, water, and stains — and also resist breaking down. Here’s a clear look at what they are, where they show up in everyday life, why they persist, and what practical steps can lower exposure.