单词	halon
释义	halon /ˈheɪlɒn / noun Any of a number of unreactive gaseous compounds of carbon with bromine and other halogens, used in fire extinguishers, but now known to damage the ozone layer.The protocol restricts the manufacture and use of human-made, ozone-depleting compounds, such as chlorofluorocarbons and halons.... However, halons were found to harm the ozone layer and, under the Montreal Protocol of 1987 (which the United States signed on to), developed countries were required to phase out production of those gaseous agents by 1994. New data centers and those that undergo significant refurbishment are directed by the 1987 Montreal Protocol to use halon alternatives because of ozone-depleting properties of halon. Origin 1960s: from halogen + -on.
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