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Memory Alpha
For the similarly named compound, please see ammonium.

Ammonia is a toxic gas compound with the formula NH3.

In 2365, the USS Enterprise-D investigated the planet Theta VIII and found the atmosphere to contain ammonia, nitrogen, methane, liquid neon and other substances. Wind speeds were as high as 320 meters/second, which could lead to ammonia tornadoes. (TNG: "The Royale")

In 2370, the Enterprise-D inspected the vessel USS Raman via an interface probe controlled by Geordi La Forge. The probe entered a hull breach in the aft section of the Raman and detected atmospheric gases inside the corridor – primarily methane and ammonia. (TNG: "Interface")

In a deleted scene from the Star Trek: The Next Generation seventh season episode "Genesis", Data describes the smell in a USS Enterprise-D shuttlebay as a mixture of methane, uric acid and ammonia. [1]

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