SMOG is an acronym for 'smoke and FOG, ' which is a type of air pollution caused by the burning of fossil fuels. It is made up of a combination of pollutants, including particulate matter, nitrogen oxides, sulfur dioxide, and other gases. The crossword solutions for SMOG are MIST (4 letters), CLOUD (5 letters), FOG (3 letters), HAZE (4 letters), and AIRAPPARENT (11 letters). MIST is a collection of tiny water droplets suspended in the air, while CLOUD is a visible mass of condensed water vapor. FOG is a thick CLOUD of tiny water droplets that form near the ground, while HAZE is a thin, dry, dust-like suspension in the air. AIRAPPARENT is a term used to describe air that is free from any visible pollutants.