As an adjective smoggy is
having smog.
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Not English
Wikidiffcom has no English definition. It may be misspelled. smoggy
English
Noun
(Smoggies)
(Northern England, Geordie, Northumbria, pejorative) A person from Middlesbrough.
Usage notes
Originally considered to be offensive, but more recently has been adopted by the people of Middlesbrough when referring to themselves and in this context is no longer considered offensive.
English informal demonyms