Carbon Tetrachloride: Ozone-depleting Compound Persists Decades Later

Carbon tetrachloride (CCl4) was once used in dry cleaning and as a fire-extinguishing agent but once it was found to be a cause of ozone depleted, it was regulated in 1987 under the Montreal Protocol along with other chlorofluorocarbons. Parties to the Montreal Protocol have reported zero new CCl4 emissions since, though worldwide emissions of CCl4 still average 39 kilotons per year, about 30 percent of emissions prior to the treaty going into effect. read more

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