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One of the most important factors influencing a city's climate is the ventilation of a given urban unit. The most effective avenue of wind penetration into a built-up area is provided by uninterrupted urban greenery, thoroughfares and railway land radiating from the city centre as well as river valleys cutting through the entire city creating a unified system. These areas are called urban ventilation corridors or urban ventilation wedges. In Warsaw such an air exchange and regeneration systemdoi:10.7163/gpol.0057 fatcat:3pyzix3q7na3hetwqoxhkxz2cu