Toxicology

A new EPA rule will limit PFASs, or “forever chemicals,” in your drinking water for the first time. Here’s what that means for you

Protecting people from lead poisoning requires developing and using powerful tests

A deadly food poisoning outbreak highlights how little we know about morel mushrooms

Banning formaldehyde hair relaxers might help protect Black women’s health, but won’t end the racism that drives their use

Growing evidence suggests certain hair products marketed toward Black women may be harmful to their health. Scientists, entrepreneurs and policy makers are taking steps to fix the problem

A federal rule would require companies to disclose whether their products contain chemicals known as PFASs

A CRISPR gene-editing technique might have finally cracked the mystery of how death cap mushrooms kill and revealed a possible antidote

A train carrying toxic and combustible materials derailed recently in Ohio. Here’s what we know about the situation—and what we can’t know yet

Analysts explain why some fear that the Russian military will use chemical weapons—and how the world would know if it did

The chemical concentrations exceed EPA limits, and new human studies suggest they could do long-term damage