The present invention relates to an integrated air quality management system in a city, by matching outdoor air quality measurement terminals that are arranged at different locations to measure outdoor air quality, and outdoor air quality information transmitted from the outdoor air quality measurement terminals by corresponding locations An integrated management server that generates and provides outdoor air quality distribution information according to location, measures indoor air quality, receives outdoor air quality information corresponding to the location of the building from the integrated management server, and compares and analyzes indoor and outdoor air quality, According to the analysis result, a building management server that controls a ventilation device that ventilates the indoor air and outdoor air of the building to be exchanged, and an integrated management server to check the outdoor air quality distribution information, access the building management server to control the ventilation system The ventilation device is provided with a user terminal capable of transmitting a ventilation operation signal instructing operation, and the building management server is applied when it is determined that the operation of the ventilation device is necessary for the day time zone and the night time zone set according to the season. It is constructed to apply different operating on-time maintenance intervals.
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