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change chemical clean climate cloud co2 commercial dioxide dirty ecology effect emission emissions energy environment environmental factory friendly fuel gas industrial industry low nature oxygen poison pollutants polluted pollution protection restriction sign smoke steam symbol technology traffic transport transportation warning waste zoneLow Emission Zone Stock Photography
![City warning sign with the Dutch text for \](https://thumbs.dreamstime.com/m/city-warning-sign-dutch-text-emission-zone-front-camera-surveillance-system-338502821.jpg "City warning sign with the Dutch text for \")
![City warning sign with the Dutch text for \](https://thumbs.dreamstime.com/m/city-warning-sign-dutch-text-emission-zone-front-street-buildings-353356945.jpg "City warning sign with the Dutch text for \")