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English definition of “emission unit”

emission unit

noun [C, usually plural]     (also emissions unit) ENVIRONMENT
a right of a company to put an amount of harmful gases into the air equal to 1000 kilograms of carbon dioxide (= a gas formed when carbon is burned ): In Europe nearly all of the valuable emission units were given away to power companies .
(Definition of emission unit noun from the Cambridge Business English Dictionary © Cambridge University Press)
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