Ammonia (NH3) is a chemical compound, a toxic gas comprised of the element nitrogen and three molecules of hydrogen.

In the year 2365, the Federation starship USS Enterprise-D performed sensor scans of planet Theta 116 VIII and found weather activity in the atmosphere described as ammonia tornadoes. (TNG episode: "The Royale")

The atmosphere of Marijne VII leaked into the hull of the damaged USS Raman in 2370. Upon finding the Raman trapped in the atmosphere, the Enterprise-D used an interface probe controlled by Geordi La Forge to detect ammonia and methane in a ship's corridor. (TNG episode: "Interface")

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