This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Air pollution caused by substances (such as sulphur dioxide) emitted by a volcano.

"(Added: vog is volcanic fog, that is, the murky sulphuric haze burped by the volcano on the Big Island which can get particularly bad when the volcano is actively burping a lot AND when the trade winds, which blow out of the east, aren't blowing the vog west into the Pacific.)"

slaggy    unborrowed    shock-induced    too-familiar    blood-warm    orange-pink    blue-black    three-colored    moon-drenched    hot-weather