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Ammonia: A colorless gas with a sharp, irritating odor, having a density about 0.6 that of air; it is emitted in large quantities by animal feedstocks and sewage treatment plants. Ammonia is very soluble in water and is removed from the atmosphere by clouds.
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Tom Skilling is chief meteorologist at WGN-TV. His forecasts can be seen Monday through Friday on WGN-TV News at noon and 9 p.m.
WGN-TV meteorologists Steve Kahn, Richard Koeneman and Paul Dailey plus weather producer Bill Snyder contribute to this page.
