Planetary atmospheres are much more than gaseous envelopes, as they also host a plethora of suspended particles. These form complex systems that are usually called clouds, hazes or aerosols, vaguely depending on their origin and characteristics. In this seminar, we will review the current knowledge of particulates in the atmospheres of the Solar System and we will also provide some hints on the current prospects for extra-solar planets atmospheres. The physics of their formation and detection methods, as well as their limitations, will be discussed. Finally, we will analyze in detail some interesting examples from a number of ongoing space missions, such as the mysterious blue absorption in Jupiter, the ubiquitous airborne dust in Mars or the cold hazes in the atmospheres of the icy giants, Uranus and Neptune.

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