One of the major causes of air pollution in underground parking lots is the exhaust gas emitted from cars. There are a lot of harmful chemical substances in exhaust gas. One of them is CO2 gas whose concentration needs to be kept under the limit by using ventilation facilities. An economic ventilation system is commonly used in underground parking lots to keep polluted zones to a minimum. This helps maintain good indoor air quality and prevents condensation during summer. It sprays car exhaust gas in underground parking lots in high speed and swiftly induces gas to the exhaust pipe.
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