Unusual Fog-clearing Apparatus Keeps Airline Passengers Moving

Make-believe fog is a frequent special effect used in the theater and at rock concerts. Usually created with dry ice, frozen carbon dioxide crystals, the smokey mist rolling across the stage creates a sense of mystery and suspense. But when real fog settles over an airfield, it creates delays or even danger. At an airport in the western state of Oregon, ground crews take matters in their own hands when freezing fog threatens to delay takeoffs and landings. And they use the same substance...

© La Voix de l'Amérique - mardi 14 mars 2017