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I know never to mix cleaners and to certainly never mix ammonia and chlorine but many cleaners contain ammonium chloride. Is this not essentially ammonia and chlorine? If not, how does it differ? If it is similar, what is done to it so it doesn't kill the user? I am obviously not a chemist and have merely an nodding acquaintance with the periodic table, so I would ask that your explanations be simplified as much as possible, as Einstein said, "As simple as possible but no simpler." Thanks

In the first clinical study to clearly link World Trade Center dust to serious and sometimes fatal diseases, doctors have found that the number of New York City rescue and recovery workers with a rare type of lung-scarring condition soared in the year after the trade center collapsed. Doctors from the Fire Department and at the Albert Einstein College of Medicine found that 13 firefighters and emergency medical service workers with the department developed sarcoidosis, a debilitating illness in which the lungs and other organs develop inflammation that produces lumps of cells, called granulomas. The illness can be controlled with...