Irritation due to breathing noises in dojo This might seem a silly question, but unfortunately I am extremely oversensitive to human noises. I don't mind meditation with the noise of traffic, or a thunderstorm, or the monotonous drone of a ventilator. But when I am trying to do za-zen in a dojo with other people and I hear other people breathing loudly through their noses, it drives me nuts and puts me in an extremely bad mood. Basically, I stop the meditation and just start thinking about my work or something, to stop noticing the noise. I know this is wrong, and somehow I should make the noise, the other person's breathing and my own irritation part of the meditation: observe my irritation and meanwhile keep getting back to my own respiration, but I wonder whether there is some advice, some trick, to make this easier. I know I am my own biggest enemy here, but it's a problem that keeps on occurring and it's hard for me to get out of this trap.
I hear other people breathing loudly through their noses, it drives me nuts and puts me in an extremely bad mood. 

You are quite fortunate to have these kind souls gently show you the rough spots in your meditation. If you were alone, steeped in quiet, there would be no such disturbance. If there is suffering somewhere, it is attached to delight (MN1). For example, if one delights in quietness, seeking refuge from chaos on the cushion, then such disturbances would irritate. It would irritate especially if there is a sense of "my meditation" and "their noise". This is identity view and SN22.155 says:


  But by not grasping what’s impermanent, suffering, and perishable, would identity view arise?”
  “No, sir.”


Breathing noises come and go. In and out. They are not permanent. Instead of thinking "that person keeps breathing loudly!", simply think "There is an in-breath." Later, notice that "There is an out-breath".  In doing so, the impermanence manifests. Seeing the impermanence, the next step is to recognize that it really has nothing to do with you:


  This is not mine, I am not this, this is not my self --MN62


Knowing that this is not your self, simply count your own breath and return to that peace you thought threatened. It's not just your peace, it's also their peace. They, over there, are hearing your own breathing. Give them the gift of peace by gently attending to your own breath.