Characterizes the toxicologic and adverse health effects info. for ammonia, a colorless gas with a sharp odor that is made both by humans and by nature. Ammonia is a source of nitrogen for plants and animals. 80% of all manufactured ammonia is used as fertilizer. This profile includes: (1) The examination of available toxicologic info. and epidemiologic evaluations on ammonia to ascertain the levels of human exposure for the substance; (2) A determination of whether adequate info. on the health effects of ammonia is available to determine levels of exposure that present a risk to human health; and (C) Identification of toxicologic testing needed to identify the levels of exposure that may present risk of adverse health effects in humans. Charts and tables. This is a print on demand edition of a hard to find publication.