The ozone is a single layer. There is no upper and lower layer.
The ozone layer is found in the level called stratosphere. Ozone layer is within this layer.
Troposphere ozone is also called as ground level ozone. This is the harmful ozone of the total one.
If the level of ozone is below certain concentration, then it is ozone depleted. It is called as ozone hole.
Troposphere contains ground ozone. It is also called bad ozone.
Bad ozone is the common name. The name for bad ozone is ground level ozone. It is because most of it is present as a ground level pollutant.
The ozone layer is found in the level called stratosphere. Ozone layer is within this layer.
Troposphere ozone is also called as ground level ozone. This is the harmful ozone of the total one.
The ozone at the ground level acts as a polluntant. It is called as ground ozone/
If the level of ozone is below certain concentration, then it is ozone depleted. It is called as ozone hole.
Troposphere contains ground ozone. It is also called bad ozone.
Bad ozone is the common name. The name for bad ozone is ground level ozone. It is because most of it is present as a ground level pollutant.
See "How can ozone be harmful and helpful?" in the "Related questions" section below.
The harmful levels are below 220ppm. It falls below that level and it is called ozone hole.
The Hole in the Ozone Layer.
Ozone level is the concentration of ozone. It should not be very low.
High level ozone or good ozone. It is the layer of atmosphere.
Ozone present in the troposphere is also called as bad ozone. It is also a green house gas. It is the major constituent of the urban smog.