Dust storm
A wall of airborne dust — visibility lost to a moving mass of small particles.
A dust storm in a dream is the dream's image of visibility lost not to darkness but to many small particles in motion. You cannot see, you cannot breathe cleanly, and the air itself has become the obstacle. The dream brings the dust storm when a wave of many small distractions — opinions, notifications, accusations, minor crises — has filled the air around a decision you were trying to make. A dust storm waited out in shelter is the dream telling you the storm will end and the visibility will return. A dust storm walked into without covering is the dream noting that you tried to make the decision in conditions where clear sight was impossible.