STI evaluated and optimized the Peace Airshed Zone Association’s (PAZA) ambient air quality monitoring network to help PAZA better meet their monitoring objectives. STI reviewed the network’s existing sites with these objectives in mind, and built a conceptual model of the network. STI then performed statistical and spatial analyses to improve the model and improve the overall understanding of the monitoring network. Using these collected data, STI finalized recommendations for improving the network through a series of reports and presentations to PAZA technical staff and stakeholders.