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Parameter Tree:
EARTH SCIENCE > ATMOSPHERE > AIR QUALITY > EMISSIONS
Definition:
With respect to pollution, the discharge of gases or particles from a
source such as a smokestack or exhaust pipe into the atmosphere, perhaps
resulting in environmental pollution. With respect to radiation, the
generation and sending out of radiant energy. 
Reference:
Glossary of Meteorology, American Meteorological Society, 1998. Glossary of
Weather and Climate, American Meteorological Society, 1996.
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