While ozone (O3) is toxic (it forms during an electrical fire) It exists as a thin layer at the top of the atmosphere , filtering out most UV light, and formed by the action of UV light on oxygen. It is unstable and is in a delicate equilibrium with O2.Without it, life would not be possible.
The ozone layer becomes harmful in some cases. This is when it depletes.
Halogenalkanes are harmful to ozone. They react with ozone and deplete it.
No ozone is not always harmful. the ozone at stratosphreric level is good.
Halons are harmful for ozone. They also react with ozone to deplete it.
Ozone is harmful at ground level. It acts as a pollutant.
The harmful ozone is present in the troposphere. It is also called bad ozone.
Halogenalkanes are harmful to ozone. They react with ozone and deplete it.
No ozone is not always harmful. the ozone at stratosphreric level is good.
Halons are harmful for ozone. They also react with ozone to deplete it.
Ozone in troposphere is harmful. It acts as a pollutant.
The harmful effects of ozone are seen at ground level. Ozone acts as a pollutant there.
Ozone layer cannot be harmful. It protects us from harmful UV rays of the sun.
The ozone is harmful not at stratosphere. It is harmful at some layer. Te layer is troposphere.
Ozone is harmful at ground level. It acts as a pollutant.
It is harmful at ozone layer. It is because this leads to depletion of ozone.
The harmful ozone is present in the troposphere. It is also called bad ozone.
Ground ozone is harmful. It acts as a pollutant.
See "How can ozone be harmful and helpful?" in the "Related questions" section below.