Total reactive oxidized nitrogen (NOy) is measured at more than 80 sites across the U.S. to better understand ozone formation and atmospheric chemistry processes. The analyzer uses a heated molybdemum converter upon a 10m tower to convert all oxidized nitrogen species to NO while a second sample train draws ambient air. A chemiluminescence detector measures NO from both sample trains providing hourly concentrations of NO and NOy. Routine ambient monitoring networks such as the Clean Air Status and Trends Network (CASTNET), Chemical Speciation Network (CSN), and Interagency Monitoring of Protected Visual Environments (IMPROVE) network measure nitrogen-containing gases and particles contributing to the total reactive nitrogen budget, but without key components such as total reduced nitrogen (NH_x) and nitric acid (HNO₃). The routine networks also lack the temporal resolution needed to relate atmospheric chemistry to other processes with important diurnal variability (e.g., air-surface exchange, emissions, solar radiation, boundary-layer height). In this study, Wood E&IS, Inc. designed an enhanced chemiluminescence system to measure total reactive nitrogen (TNr), NOy, NO₂, NO and NH_x, HNO₃ and NO_z by difference. The system uses one NO detector to eliminate the need to bias correct between different analyzers. Chemical transport and deposition models would benefit from hourly measurements of HNO₃, NO₂, and NH_x at a large number of sites located in rural and urban areas as these are significant contributors to the total and dry nitrogen deposition budget.