In various industrial holdings dust emission to the atmosphere is an undesirable outcome associated with the operation itself. In the case of open pit mining, the dust emission is a major problem as it tends to affect the inhabitants of nearby towns and, sometimes, the employees of the mines in the accommodation that companies build when there are no populations in the sorroundings of large mine pits which extract the mineral.

It should be noted that the problem does not arise for those working inside mining machinery as with filters and pressurized atmosphere prevents dust from entering the cabins of the machines. But this is not so for those living permanently or temporarily in the surroundings (kilometers) of the mining.

Thus the problem of dust is affected by the problem of propagation of the dust from the points at which it is produced to transitional accommodations in the surrounding towns which are often locatedmany thousands of people.

This spread can occur both day and night. Overall daytime propagation problems are minor because the convective updrafts generated by heating the ground with solar radiation, are an effective dust emitted mixed with clean air located tens of meters above the ground and natural convection forced to fall as a result of hot air mixed with dust that is bound to rise.

For that the problems of propagation of fine dust (particulate matter 10 microns or less) miles from the source, are associated with the night. This nocturnal propagation is what we refer as follows.