atmospheric-inversion

Science Dictionary
inversion   (ĭn-vûr'zhən)  Pronunciation Key 
A departure from the normal effect of altitude on a meteorological property, especially an atmospheric condition in which the air temperature rises with increasing altitude. ◇ A layer of air that is warmer than the air below it is called an inversion layer. Such a layer traps the surface air in place and prevents dispersion of any pollutants it contains.
The American Heritage® Science Dictionary
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