To protect the ozone layer, The Montreal Protocol on Substances that Deplete the Ozone Layer came into effect in 1987 and in 1989 China joined the protocol later on.

• 1987年,旨在保护臭氧层的《关于消耗臭氧层物质的蒙特利尔议定书》生效,我国也在1989年加入。