The stratosphere is the second layer of a planet's atmosphere, just above the troposphere. Traveling through the stratosphere in a starship was often times turbulent. (VOY: "Friendship One")

Baristatic filters, such as those used on the planet Tagra IV, cleaned a planet's air by shooting negative ions into the stratosphere. (TNG: "True Q")

In 2370, when Boraal II was undergoing atmospheric dissipation due to intense plasmonic reactions, the planet's stratosphere was in the process of breaking down when the USS Enterprise-D arrived in response to a distress call. (TNG: "Homeward")

One of the desert regions of a Nezu colony was noted to have substantial cratering, atmospheric shock waves, and large concentrations of dust and other stratospheric contaminants. (VOY: "Rise") The stratosphere /ˈstrætəsfɪər/ is the second major layer of Earth's atmosphere, just above the troposphere, and below the mesosphere. It is stratified in temperature, with warmer layers higher up and cooler layers farther down. This is in contrast to the troposphere near the Earth's surface, which is cooler higher up and warmer farther down. The border of the troposphere and stratosphere, the tropopause, is marked by where this inversion begins, which in terms of atmospheric thermodynamics is the equilibrium level. At moderate latitudes the stratosphere is situated between about 10–13 km (30,000–40,000 ft; 6–8 mi) and 50 km (160,000 ft; 31 mi) altitude above the surface, while at the poles it starts at about 8 km (30,000 ft; 5 mi) altitude, and near the equator it may start at altitudes as high as 18 km (59,000 ft; 11 mi).

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