Since sodium hypochlorite is the active ingredient in chlorine-based bleach, it may first decompose to form hydrochloric acid, which can then lead to the formation of chloramine vapours.
However, in terms of general usage, the word 'bleach' is used to refer to common household bleach, which consists of 3-8% sodium hypochlorite and trace amounts of sodium hydroxide.
This is really handy for getting rid of stains but as you can tell by the formula, sodium hypo-chlorate also contains chlorine, which happens to be really good at killing things.