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The incorrect statement among the following regarding photochemical smog is:
| 1. | Carbon monoxide does not play any role in photochemical smog formation. |
| 2. | Photochemical smog is an oxidising agent in character. |
| 3. | Photochemical smog is formed through a photochemical reaction involving solar energy. |
| 4. | Photochemical smog does not cause irritation in the eyes and throat. |
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