en.wikipedia.org/wiki/Io_(moon)

Io has an extremely thin atmosphere consisting mainly of sulfur ... Gas in Io's atmosphere is stripped by Jupiter's magnetosphere, ...

www.space.com/33633-jupiter-moon-io-collapsible-atmosphere.html

Aug 3, 2016 ... Jupiter's volcanic moon Io boasts an atmosphere made from sulfur dioxide gas — when the satellite is in sunlight. For the first time, researchers ...

www.space.com/16419-io-facts-about-jupiters-volcanic-moon.html

Aug 14, 2018 ... Jupiter's fifth moon, Io, is the most volcanically active body in the solar .... Because of the volcanic activity, Io's atmosphere contains mostly ...

www.windows2universe.org/jupiter/moons/io_atmosphere_overview.html

There are no clouds and lightning. The atmosphere of Io is very thin and does not remain bound to Io for very long. Even so, it has an important impact on the ...

solarsystem.nasa.gov/moons/jupiter-moons/io/overview

Io is the most volcanically active body in the solar system. ... Io's very thin atmosphere is primarily sulfur dioxide, which on Earth is sometimes used to preserve ...

solarviews.com/eng/iomountain.htm

It would seem that Io should have a substantial atmosphere due to its numerous volcanoes spewing out massive amounts of gas and lava.

www.astronomy.com/news/2016/08/io-has-a-unique-collapsing-atmosphere

Aug 3, 2016 ... Jupiter's closest moon, Io, has an atmosphere that collapses when it is eclipsed by the gas giant.

www.sciencedaily.com/releases/2016/08/160802133701.htm

Aug 2, 2016 ... Astronomers have documented atmospheric changes on Io, Jupiter's volcanically active satellite, as the giant planet casts its shadow over the ...

www.iflscience.com/space/ios-entire-atmosphere-collapses-whenever-hides-jupiters-shadow

Aug 3, 2016 ... Every time the volcanic moon of Io is eclipsed by Jupiter, the atmosphere freezes and rains down as snow onto the surface. When it's in direct ...