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Because mistakes of the past take a long time to go away. And some Man-made sources that accelerate ozone destruction have not been fully identified (say water vapor delivery to the upper atmosphere by commercial aircraft). The CFCs, and to a lesser extent the HCFCs, that we have produced since the early 1900s are still in the atmosphere. There are no natural cycles that will remove them, other than photoactivation in the ozone layer (and perhaps supercooling them to liquids at the poles).
The ozone layer is currently in danger due to the release of ozone-depleting substances, such as chlorofluorocarbons (CFCs) and halons, which are widely used in refrigerants, aerosol sprays, and firefighting equipment. These substances break down ozone molecules in the stratosphere, leading to the thinning of the ozone layer and the formation of the ozone hole over Antarctica. Efforts to reduce the production and consumption of these substances have been made through international agreements such as the Montreal Protocol.
There are still some CFCs being released from old refrigerators and car air conditioners. CFCs take seven years to reach the troposphere, where the ozone is, and chlorine radicals remain there, continually attacking ozone.
Scientists hope that the ozone layer will be restored by about 2050.
Ozone is an unusual type of oxygen molecule. Normally, there are higher concentrations of ozone at various altitudes in the stratosphere. Sometimes, under the right conditions, chemical reactions in the ozone layer can destroy most of the ozone, creating an ozone "hole".
Damage to the ozone layer is a rising concern. It is a concern because the depletion of the ozone causes increased amounts of UVB rays from the sun. This causes various types of skin cancers and evident damage on crops.
See "What makes scientists think the ozone layer is thinning?"
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Why is the ozone layer named the ozone layer?
Ozone layer contains ozone in it. Therefore, it is named so.
What planet includes a layer of ozone?
Earth has a layer of ozone. It is present as the ozone layer.
What planet has a protective ozone layer?
Earth and Venus have a protective ozone layer. These planets have ozone molecules in ozone layer.
What layer of the atmosphere contians the ozone layer?
Stratosphere contains the ozone layer. It is a pool of ozone molecules.
Where are all the layers of the ozone layer?
There are no layers in the ozone layer. It is a single layer of pool of ozone gas.
What is a danger to the ozone layer?
Greenhouses are a danger to the ozone layer
What element is a danger to the ozone layer in the stratosphere?
Ozone element is in danger. It is present as ozone layer.
Which ones are a danger to the ozone layer in the stratosphere?
CFC's are a danger. They deplete the ozone layer.
What is a danger to the ozone layer in the stratoshpere?
CFC's are a danger to ozone. They react with ozone to deplete it.
Is oxygen a danger to the ozone layer in the stratosphere?
No oxygen is not a danger to ozone layer in stratosphere. It is because oxygen itself participates in the creation of ozone.
What danger will it be to the earth is there was no ozone layer?
The danger will be to earth if there was no ozone. Destruction would be at peak.
What are the danger to the ozone layer in the stratosphere?
The ozone layer in the stratospheric region is in danger as it is being depleted. It is because of the high use of ozone depleting substances by human beings.
The dangers of the ozone layer?
If you lived there, it could harm your lungs. Otherwise, the ozone layer presents no danger.
Is oxygen in the ozone layer a danger to the stratosphere?
No,it is not. It is the helpful one as it forms the ozone.
What are a danger to the ozone layer in the stratosphere?
The ozone hole is in danger as it is depleting. It is caused due to natural and man made factors.
Is the ozone layer currently being damaged?
Yes, the ozone layer is being damaged by the humans. CFC's are main reason for depletion of ozone layer.
Is oxygen a danger to the stratosphere?
No it is not. Oxygen is the one that creates the ozone layer.
