The advisories impact large areas of Idaho, Oregon, Montana and Washington, lasting through the end of January.

Jan. 31, 2025 — Low levels of traffic-related air pollution harms the liver and may raise the risk of metabolic-associated fatty liver disease, a new study in mice ... Wildfire Smoke Can Carry ...

Doctors from National Jewish Health talk about how to know if you’re at risk, and steps you can take to protect your heart ...

Toxic smoke and dangerous particulate pollution are spreading far beyond the flames, leaving air quality at unhealthy levels ...