The finest particles pose the greatest risk because they can penetrate deep into the lungs and cause death by asphyxiation in the worst cases. Mild, short-term symptoms often resolve with rest.

Ash from the 1912 Novarupta eruption periodically hits the west side of Kodiak Island, Larsen Bay and Karluk, roughly 65 ...

Mount Spurr volcano, near Anchorage, Alaska, is showing increased activity. Scientists have detected a swarm of earthquakes ...