Chemosphere
[kee-muh-sfeer, kem-uh-] /ˈki məˌsfɪər, ˈkɛm ə-/
noun
1.
the region of the atmosphere most characterized by chemical, especially photochemical, activity, starting in the stratosphere and including the mesosphere and perhaps part of the thermosphere.
/ˈkɛməˌsfɪə/
noun
1.
(meteorol) a rare name for thermosphere
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