I too want to know what that ammonia smell is when I inhale then exhale I smell it bad plz give feed bk .I jus noticed this recently.;0(
Now you mention it I've had this too. I think it's sinus congestion that clears when you exercise so you smell it a bit.
I know what you are talking about. I get the same thing happening to me, but it happens almost randomly. Its almost bothersome for me because i feel like i am just smelling the inside of my lungs through the back of my through.
Sometimes i worry about what it could be, but i try not to think about it. This is the first time that i have actually tried to find out about it and search online, but not one else, except you, has experienced the exact same thing as me.