The deadly smog that hovered over London claimed more lives than one could ... The toxic, black-yellow fog reduced visibility to just several dozen feet, resulting in many accidents.

Without warning, noxious fog would roll in for days and sometimes weeks ... which was different from the sulfurous smog that claimed lives in Donora, Pa., and London, England. In those places, the ...

Fog most often forms (archived here ... A historical example of this phenomenon is the Great Smog of London in 1952 (archived here), when an extended period of cold, stable weather combined ...