Road sign. Road sign indicating maximum speed limit and smog ahead. Smog is a form of air pollution formed when sunlight acts on emissions from vehicles and industrial processes. This forms secondary pollutants that also combine with the primary emissions to form photochemical smog | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Kets, Jimmy / Reporters |
Bildgröße: | 3425 px × 5138 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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