All Fog, Mist and Haze

This group collects the Meteorology subcategory's members that are reduced-visibility conditions caused by suspended water droplets, ice crystals or particulate matter near ground level: fog in its several named regional and formation types, mist, haze, smog and the sea smoke that forms over cold water. These share a single defining trait, visibility reduced by something suspended in the near-surface air, distinct from the subcategory's storm and severe-weather group, whose members are defined by an active weather system rather than by reduced visibility alone.