Environmental Engineering Reference
In-Depth Information
Fig. 6
Internal inter-peak PNCs
In the case of the West bore, internal concentrations peaked when the vehicle was
about to exit the tunnel indicating a spatial delay of 190 m. In the case of East bore,
the delay is 400-500 m. This could be due to a time lag in external air penetrating
inside the cabin. This delay was prolonged due to the fan in the car set to recircula-
tion mode.
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