copied and pasted the following two paragraphs from other sites on the web. I mixed ammonia and chlorine by accident many years ago and never forgot it. I was lucky to get outside into fresh air.
When urine begins to smell like ammonia, it usually means one of two things. First, it could be that you are a bit dehydrated and therefore your urine is more concentrated. All urine has ammonia which is a normal product of the metabolism of protein.
Mixing bleach and ammonia is extremely dangerous, since toxic vapors will be produced. The primary toxic chemical formed by the reaction is chloramine vapor, with a potential for hydrazine formation.