This is an image of Pluto.
Click on image for full size
Image from: NASA
An Overview of Pluto's Atmosphere
It may seem hard to believe that Pluto could have an atmosphere because it is so cold at 39 AU, where Pluto resides, but it does. Because there are times when Pluto is closer to the sun than is Neptune (making it the 8th planet for roughly 20 years at a time), ices on Pluto's surface evaporate and form an atmosphere. It is continually produced and lost again as long as Pluto is inside Neptune's orbit.
The air is made mostly of nitrogen gas, just like that of the Earth and Saturn's moon Titan, with the addition of carbon monoxide (CO - what comes out of your car) and methane (CH4).
The atmosphere is also similar to that of Neptune's moon Triton.. On Triton there are seasons and motions within the atmosphere. Because Pluto has a heavier atmosphere than Triton, there may even be clouds, winds, and storms. However, seeing these clouds and winds on Pluto is difficult.
It is also possible that the presence of nearby Charon draws material escaping from Pluto's atmosphere to recondense on the surface of Charon, as suggested in this image. So this binary planet may exchange atmospheric molecules.
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