Mysterious stenches are not new. Charles Fort logged quite a few in his works. The smell is usually described as sulphurous or rotten eggy. Interestingly, that's also a smell attached to Bigfoot who is described as extremely pungent and often unbearably so. The 1952 Flatwoods monster was also described as giving off a powerful pungent odor that caused the eyes to water if we give the story any credence. Whether there is a connection, I don't hazard to guess.