The City of Pittsburgh had decided to implement a new air pollution monitoring and warning system to provide residents with high resolution, real-time air quality data to help reduce residents' risk. Data from the new sensors is transmitted wirelessly to a set of nodes. A total of 6 nodes are required to accommodate the necessary data traffic, but more could be added to share the load in a k-out-of-n redundant system. Assuming each node has a reliability of 0.91, they cost $15,000 each, and the city has decided to install a total of 9 nodes in total, what minimum value is the City of Pittsburgh placing on the air quality data?