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What is the primary method of air exchange in the metro tunnels?

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Final answer:

The primary method of air exchange in metro tunnels is mechanical ventilation.

Step-by-step explanation:

The primary method of air exchange in metro tunnels is mechanical ventilation. Metro tunnels are typically equipped with a system that uses fans and duct work to continuously remove indoor air and distribute filtered and conditioned outdoor air throughout the tunnels. This helps to maintain air quality and ensure a comfortable environment for passengers.

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