I found this sentence in Cambridge dictionary when looking up the word "relive":
Whenever I smell burning, I relive the final moments of the crash.
Then I looked up the word burning in Oxford Advanced Learner's Dictionary and saw these meanings:
- (of feelings, etc.) very strong; extreme
- a burning issue/question: a very important and urgent problem one of the burning issues of the day
- (of pain, etc.) very strong and giving a feeling of burning
- very hot; looking and feeling very hot
- burning eyes (literary) eyes that seem to be staring at you very hard
Oxford Advanced Learner's Dictionary 9th edition © Oxford University Press, 2015
And it says that burning is used only before noun when it's an adjective and in the phrase burning hot as an adverb. Here it's not before a noun but after a verb and I don't know which meaning is the one of "burning" in the example.