Vog is the air pollution caused when sulphur dioxide and other volcanic gases react with oxygen. The word vog is a portmanteau of volcano and fog. This is part of a complete episode.
data smog n.— «She said most of her peers don’t know where to turn on the Internet besides free search engines. “It’s complicated,” she said. The Association of College and Research Librarians refers to it as “data smog.” Students deal...
vog n. volcanic smog. (source: Double-Tongued Dictionary)