Which of the following statement(s) is wrong?
| 1. | Ozone is not responsible for the greenhouse effect. |
| 2. | Ozone can oxidize sulfur dioxide present in the atmosphere to sulfur trioxide. |
| 3. | Ozone hole is thinning of the ozone layer present in the stratosphere. |
| 4. | Ozone is produced in the upper stratosphere by the action of UV rays on oxygen. |
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