Dust is an irritant from a source which may not be immediately seen. If you dream of dust, it can mean you are bothered by an irritant or inconvenience.
If you see dream imagery of yourself in the act of doing something and dust was bothering you, then you can infer that this situation happened in real life too. You may need to correlate this dream symbol of dust, to the actual thing in reality. What is the inconvenience or dust that is hindering your performance of tasks? You might need to take care of this dust before you can continue your activity properly.
If you are facing an issue in real life that involves timing for a situation, then the metaphorical dust you saw in your dream, can be a message to “let the dust settle”, before you continue with your plans.
Prompt – dust from 3TC