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The abnormal reversal
of temperature in the troposphere caused by the entrapment of urban air
pollution. Under normal circumstances, air in the troposphere is cold at
high altitudes and warm at low altitudes, or near the earth's surface.
When air pollutants, such as SO2 or NOx, in urban
areas get too concentrated, smog is produced. Since cold air underlies the
warmer air at high altitudes, the air does not mix well which can lead to
human health disturbances in people with respiratory illnesses such as
asthma.
[Atmospheric Environment, v. 35, Issue 13, p. 2417-2421]
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