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.

On April 13, 1949, a massive 6.7 magnitude earthquake rattled western Washington. Eight people were killed, and numerous ...

When people think about volcanoes, they often picture places like Hawaii or Yellowstone—not Colorado. But did you know that ...