When you dream gas means: It can be dangerous to dream of gas not contained. This isn’t something you can see, but feel with your other senses. Sometimes gas can explode in dreams. This could be due to repressed anger. It also relates with unconscious emotions. The gas in your dreams becomes part of what you can tolerate or how much danger is there. To fully understand the symbolism of gas, you must look within to see what you can find contained.
(in Dream Dictionary)