An explosion in a dream is symbolic, read as sudden release of pent-up emotion or a dramatic change. Dream books point to pressure that has been building out of sight. Watching an explosion from afar is read as observing upheaval around you without being caught in it. Being close to one is taken as being shaken by a strong feeling or a sudden shift. A distant boom you cannot locate is read as unease without a clear source. Fire and smoke after the blast are read as the mess left by anger, and rebuilding afterwards as recovery. It can help to notice what you have been holding in, and how it might be released more gently.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.