The C+NO and C+O2 reactions were studied, at room temperature, in a low-pressure fast-flow reactor. C atoms were obtained from the reaction of CBr4 or CCl4 with potassium atoms and probed by their VUV resonance fluorescence. For C+NO, the overall rate constant was determined as (5.4±0.8)×10−11 cm3 molecule−1 s−1 and for C+O2 as (2.5±0.4)×10−11 cm3 molecule s−1. For the C+NO reaction, yielding N(, )+CO and O()+CN, the atomic products were also probed by their VUV resonance fluorescence. The branching ratio was estimated as 1.5±0.3.