It means there is less total column ozone than what would read 320DU.
The ozone is present inside the ozone layer. The layer warmed below the ozone is the stratosphere or upper troposphere.
See "What is the ozone hole?" in the "Related questions" section below.
The ozone layer is damaged from below. It is because of the PSC's that are catalysts for depletion.
If the level of ozone is below certain concentration, then it is ozone depleted. It is called as ozone hole.
The harmful levels are below 220ppm. It falls below that level and it is called ozone hole.
The ozone is present inside the ozone layer. The layer warmed below the ozone is the stratosphere or upper troposphere.
See "What is the ozone hole?" in the "Related questions" section below.
The ozone layer is damaged from below. It is because of the PSC's that are catalysts for depletion.
If the level of ozone is below certain concentration, then it is ozone depleted. It is called as ozone hole.
The harmful levels are below 220ppm. It falls below that level and it is called ozone hole.
The ozone hole is not actually a hole but the lowering of ozone concentration below a certain level. If the concentrations falls below the given concentration. It is referred to as the ozone hole.
See the "Related questions" section below.
See "What does the ozone layer do?" in the "Related questions" section below.
It is called ozone layer. It contains most of the ozone layer.
There is not actually a hole in the ozone layer. The ozone has been reduced below some limit.
Ozone depletion is the thinning of ozone layer below a certain concentration. This phenomenon is termed as ozone depletion.
Ozone layer means a layer of ozone. It is in stratosphere.