Corona discharge ozone (O3) generators provide valuable data on the response of vegetation to O3 exposures. Systems that use dried air as a feed gas,instead of pure or concentrated oxygen (O2), are known to produce trace nitrogen (N) oxidant byproducts that may be toxic to plants. This study quantified the concentration of total N oxidants, including nitrogen oxides (NOx, the sum of NO and NO2), dinitrogen pentoxide (N2O5), andnitric acid (HNO3), relative to O3 levels in a continuous stirred tank reactor (CSTR). The CSTR was part of computer-controlled O3 delivery and monitoring system used to study effects of O3 on vegetation within agreenhouse with charcoal-filtered air. Ozone was generated via corona discharge with dried air as a feed gas, and the system was operated at different O3 output levels and environmental conditions in seven separate trials. At O3 levels up to 330 ppb, total N oxidant concentrations in the CSTR did not exceed 9.2 ppb, when averaged over 60-sec intervals. Across all trials, the relationship between total N oxidants and O3 was described by the equation: oxidants( ) ( ) ( ) 23 ppb 0.0108 3.37 0.46; 205 =   O ppb + = = R n   . In this system, trace N oxidant levels produced under typical experimental conditions are not expected to cause direct toxicity to vegetation. Therefore, corona discharge O3 generators provide a suitable, inexpensive method of O3 production for vegetation exposure studies.