Thank you, SaturninePluto! I am absolutely sure that there was no physical cause for the scent. I even went outside to look around and see if perhaps it was a neighbor burning something or cooking-out... nothing. It has only happened once more since this post, and that has been it so far... I'll definitely try to make sure of what's going on in my life at the moment or be more aware of my surroundings to see if any other clues are around.
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