Scotch mist vs smog

Scotch mist

noun
  • A cold and penetrating mist, verging on rain. 

  • A drink of Scotch whisky served with ice and lemon peel. 

  • Something that is hard to find or does not exist. 

  • The perennial flowering plant Galium sylvaticum. 

smog

noun
  • A noxious mixture of particulates and gases that is the result of urban air pollution. 

verb
  • To get a smog check; to check a vehicle or have it checked for emissions. 

How often have the words Scotch mist and smog occurred in a corpus of books? (source: Google Ngram Viewer )