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Is air emitted from the ends (portals) of the tunnel?

April 26, 2017air emitted ends Portals tunnel

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Is air emitted from the ends (portals) of the tunnel?

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• To conform with the conditions of approval, the design of the tunnel avoids air emissions from the portals by pulling air back into the tunnel. In an incident, air may be expelled from the portals if required, to ensure that in-tunnel air quality levels remain under the set limits.