Mars has dried out over the past 4 billion years, and that may be partly because water is lofted into the upper atmosphere by dust storms and then escapes into space
Source:
https://www.newscientist.com/article/2259487-dust-storms-on-mars-are-tossing-water-from-its-atmosphere-into-space/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home