How Is Get Ammonia From Cat Urim. Ok, i haven't seen a mold causing this.but can smell ammonia/cat pee strongly where some meranti marine plywood (bs1088 btw.) used as a subfloor has gotten wet. Hazards associated with cat urine and feces:

Not only is the odor bothersome in our attempts to keep our homes clean and fragrant, it’s also dangerous, both to us and to cats. The high levels of ammonia found in cat urine may trigger your respiratory problems. According to catcentric, hydrogen peroxide is 30% more oxidizing than chlorine.