Inversion

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Term Inversion
Description An atmospheric condition caused by a layer of warm air preventing the rise of relatively cool air trapped beneath it.
Definition Inversion

An atmospheric condition caused by a layer of warm air preventing the rise of relatively cool air trapped beneath it. This holds down pollutants that might otherwise be dispersed, and can cause an air pollution episode. A layer of warm air that prevents the rise of cooling air and traps pollutants beneath it; can cause an air pollution episode.

References http://sra.org/resources_glossary_g-i.php
http://www.epa.gov/OCEPAterms/iterms.html
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