Mixing bleach and ammonia is extremely dangerous and can produce toxic gases called chloramines. Exposure to these gases can cause coughing, nausea, shortness of breath, watery eyes, chest pain, irritation to the throat, nose, and eyes, wheezing, pneumonia, and fluid in the lungs. Death from mixing bleach and ammonia is very rare, but it can happen, and toxic fumes can overwhelm you within minutes. If you accidentally mix bleach and ammonia, you should move to a safe, well-ventilated area immediately, call 911 or your local emergency services if youre having trouble breathing, and get help from your local poison control center by calling 800-222-1222 if you've been exposed to the fumes. To prevent accidental poisoning with bleach and ammonia, you should always store cleaning products in their original containers, read and follow the directions and warnings on product labels before using, and never mix bleach with any other cleaning products.