What's in wildfire smoke? A toxicologist explains the health risks and which masks can help
- Written by Luke Montrose, Assistant Professor of Community and Environmental Health, Boise State University

Fire and health officials began issuing warnings about wildfire smoke several weeks earlier than normal this year. With almost the entire U.S. West in drought, signs already pointed to a long, dangerous fire season ahead.
Smoke is now turning the sky hazy acrossa large...