Your emission, should you choose to accept it, smells aweful.

The verb emission comes from Middle French émission, which comes from the Latin word emissio, meaning "a sending out" or "a letting go."  It is the noun form of the verb ēmittere. meaning "to send out."  It's itself formed from ex ("out") and mittere ("to send"). The English word "emission" first appeared in the early 15th century, initially referring to "something sent forth" and later, from the 1610s, to the act of emitting or giving off something.  

According to the Oxford English Dictionary (OED), the noun emission was first used in English in the early 1600s, with the earliest known evidence from 1607 in the writing of clergyman and author Edward Topsell. 

Examples of "emission" used in a sentence:  
"Human emissions of greenhoulse gases are causing the Earth to warm." 
"Sulfur emissions from steel mills become acid rain."
"The emission of gases such as carbon dioxide should be stabilized at their present level."