Originally it was agreed that all use would be banned by the year 2000. With the rapid broadening of the hole in the ozone layer, however, the scope of control has been repeatedly broadened and the timetable advanced.
隨著臭氧層破洞的加速擴大，原本協定西元二千年之前完全禁用，如今管制範圍卻一再擴大，時程也一再提前。