ozone layer
ozonosphere

More information on the current state of the ozone layer is found here.

They have no known effects at all on the ozone layer.

We must all be concerned about the environment, the ozone layer.

How do we know if a hole in the ozone layer isn't a natural process?

He apparently has learned little from recent experience with earth's ozone layer.

This ozone layer is important to society and the environment for two reasons.

Until now, the ozone layer had been expected to return to its 1980 condition by about 2050.

Probably was more common before the hole in the ozone layer and all that.

The destruction of the ozone layer is a serious environmental problem.

The same applies in the case of the ozone layer.