You should be aware of regulations relating to ozone-depleting chemicals.

Since 1987 the use of ozone-depleting chemicals has declined 90 percent worldwide at modest cost, an achievement that once seemed unthinkable.

This effect will probably be temporary, says scientists, but this is no reason for complacency about ozone-depleting chemicals.

New data several years later led to an accelerated phase-out of ozone-depleting chemicals.

The original 1987 agreement under the Montreal Protocol called for a 50 percent reduction in the production of the ozone-depleting chemicals by 1998.

Levels of most ozone-depleting chemicals are slowly declining due to international action, but many have long lifetimes, remaining in the atmosphere for decades.

And unless all nations commit themselves to the elimination of ozone-depleting chemicals, the agreement is compromised.

International Most of the world's nations vowed to stop making ozone-depleting chemicals by the end of the century.

It has a tetrahedral shape and it is a recognized ozone-depleting chemical.

Du Pont and other chemical companies have been given incentives to develop ozone-depleting chemicals.