The Picture of the Day from Space Fellowship shows vog in its latest satellite photo.

Volcanic fog—vog—swirls around the Hawaiian Islands in this satellite image. Vog is formed when sulfur dioxide gas emitted from a volcano reacts with oxygen and water vapor.

The reactions form tiny drops of sulfuric acid and other sulfates, which create a visible haze. Since March 12, 2008, emissions of sulfur dioxide (the gas that forms vog) from Kilauea volcano have been elevated: 800 metric tons (1,800,000 pounds) per day in early December 2009, compared to a 140 metric ton per day (310,000 pounds) average from 2003–2007.

Source and full size image at:  Space Fellowship