[vog, vawg]
  1. air pollution containing gases and particles from a volcanic eruption combined with moisture from fog to create an unpleasant atmospheric cloud.

Origin of vog

1965–70; v(olcanic) + (f)og1 or (sm)og
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for vog

Historical Examples of vog