Chlorine bleach - a household staple - is actually a health hazard. Listed as a hazardous air pollutant in the 1990 Clean Air Act, exposure to chlorine in the workplace is now regulated by the federal government. In addition to your laundry room bleach, many household cleaners contain chlorine, though it often masquerades behind aliases such as "sodium hypochlorite" or "hypochlorite." Chlorine is a highly corrosive substance, capable of damaging skin, eyes, and other membranes. Breathing in the fumes of cleaners containing a high concentration of chlorine can irritate the lungs. This is particularly dangerous for people suffering from heart conditions and/or chronic respiratory problems such as asthma or emphysema. And the risks are compounded when the cleaners are used in small, poorly ventilated rooms, such as bathrooms. 

Pediatrician, Dr. Alan Greene, writes in his book, Raising Baby Green, "Chlorine bleach should also be banned from your laundry room.  This popular whitener and disinfectant is highly caustic;  when it goes from your drain into the natural world, it can create organocholorines, which are suspected carcinogens as well as reproductive, neurological, and immune system toxins.  They also damage the earth's ozone layer."

Source: 
Greene, Alan (2007). Raising Baby Green. San Francisco, California: Jossey-Bass.