The ammonia

The ammonia (NH3) is a gaseous polluting with an industrial origin.
Its presence in the air has been checked in every area where
productive industrial installations are presentas for the observatory
in Montoro. In the period taken in consideration in this small town
the ammonia concentration was notably superior to the time limit, while
later on its concentration decreased so much that it maintained into
the limit level established by the Umbria Region.
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