1. A system for providing air quality control for an indoor area divided into a plurality of zones, whereby air quality is controlled both centrally and at each of the zones, including: a central controller; a central damper modulated by the central controller so as to regulate a mixture of outside air and return air into a supply air stream which flows to the zones; a supply air stream duct for providing a plurality of interconnected supply channels through which the supply air flows to the zones; a return air duct for providing a plurality of interconnected return channels through which the return air from each zone recirculates; a plurality of zone dampers each appended to one of said supply channels for individually regulating the flow of supply air into each zone; a plurality of air quality sensors, one located in each zone, for providing an air quality output value for each zone; a plurality of temperature sensors, one located in each zone, for providing a zone temperature for each zone; and a plurality of zone controllers for controlling the zone dampers that regulate the flow of supply air to the respective zones, each of said zone controllers being in communication with a respective air quality sensor and a respective temperature sensor for a particular zone, each of said zone controllers furthermore being in communication with said central controller whereby said central controller receives the zone temperature and air quality value from each zone controller and is operative to modulate the central damper regulating the mixture of outside air and return air as a function of the received zone temperatures and air quality sensor values from the respective zones so as to thereby control the air quality of the supply air stream flowing to the zones.