Just back from a month in Vietnam during October and sadly disappointed when we reached Sapa they had begun to burn off .... the smoke haze and pollution was terrible and couldn't breath by late afternoon. Only managed to get a few pictures of village life etc. but distant views were impossible ... travelled halfway around the world for nothing. Don't go to Sapa when the burnoff starts. Your photos most welcome ... we struck pollution problems (I suspect coming from China too) in many places up north.