authors suggested that using these cleaning products may significantly increase the cancer risk. in particular, mixing hypochlorite bleaches with amines (for example, cleaning products that contain or release ammonia, ammonium salts, urea, or related compounds and biological materials such as urine) produces chloramines. these gaseous products can cause acute lung injury. chronic exposure, for example, from the air at swimming pools where chlorine is used as the disinfectant, can lead to the development of atopic asthma. bleach can react violently with hydrogen peroxide and produce oxygen gas: h2o2 (aq) + naocl (aq) → nacl (aq) + h2o (aq) + o2 (g) explosive reactions or byproducts can also occur in industrial and laboratory settings when sodium hypochlorite is mixed with diverse organic compounds. limitations in health care the uk's national institute for health and care excellence in october 2008 recommended that dakin's solution should not be used in routine wound care. environmental impact in spite of its strong biocidal action, sodium hypochlorite per se has limited environmental impact, since the hypochlorite ion rapidly degrades before it can be absorbed by living beings. however, one major concern arising from sodium hypochlorite use is that it tends to form persistent chlorinated organic compounds, including known carcinogens, that can be absorbed by organisms and enter the food chain. these compounds may be formed during household storage and use as well during industrial use. for example, when household bleach and wastewater were mixed, 1–2% of the available chlorine was observed to form organic compounds. as of 1994, not all the byproducts had been identified, but identified compounds include chloroform and carbon tetrachloride. the exposure to these chemicals from use is estimated to be within occupational exposure limits.