Elimination of Fog for Transportation and Aviation

Khain Alexander, HUJI, Faculty of Science, The Institute of Earth Sciences



Air pollution control, climate control

Development Stage

Advanced research stage with very positive results.

Patent Status

Provisional patent submitted


  • Fog elimination remains an unsolved problem and is a major area of interest for researchers.
  • Fog poses a serious problem for transportation and aviation and dense fog leads to the closure of airports, shipping lanes, and roads causing huge financial losses.
  • Low visibility in fog is caused by a high concentration of very small droplets that do not collide and do not sediment, remaining in the air for extended periods of time

Conventional technologies for eliminating fog include:

  • Heating the air to evaporate the fog – inefficient and requires large quantities of fuel
  • Seeding of fog with charged droplets – requires costly high-power generator of charged droplets
  • Utilization of electric mesh-precipitators – requires high-voltage equipment to charge fog, limited area of fog elimination, immobile meshes interfere with the movement of vehicles, produce negligibly small areas of fog elimination in low wind
  • Seeding the fog with dry hygroscopic nuclei in powder form - inefficient and technically difficult

Our Innovation

Technology for the elimination of fog by seeding fog with drops of optimum diameter containing solutions of salts at optimum concentration

The efficiency of the method has been proven using mathematical models of fog and in a fog chamber.


Experimental fog chamber (left) and set of sprinklers constructed near ceiling of the fog chamber (right)

Key Features

  • Very efficient technology
  • Unique technology able to eliminate warm fogs
  • Simple to apply
  • Low-cost method using readily available resources
  • A mobile system would be able to eliminate fog for 10-20 minutes over 1,000 m of the standard aircraft take-off line to the height 60-70 meters
  • Application of the method to fog elimination on roads is straightforward
  • A mobile system would be able to significantly increase the visibility on roads for a distance of several tens of meters for several minutes.

The Opportunity

  • The US National Oceanic and Atmospheric Administration reported that weather-related crashes cost tens of billions of dollars annually from personal injury, loss of life, and property damage. The estimated cost of weather-related delay to trucking companies ranges from $2.2 to $3.5 billion annually (DOT) and each year, billions of dollars are lost due to air traffic delays, of which (70 percent) is attributed to weather (Air Transport Association).


Contact for more information:

Matt Zarek
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