Chemical transformations of moist nitrogen in dielectric barrier discharge cold plasma into NO, NO₂, and NO₂⁻ in conjunction with the control for exclusive NO generation are reported. Initial gas-phase products NO and NO₂ were identified and estimated spectrophotometrically at respective absorption λ_max taking the set of three closely spaced peaks around 204, 214.5, and 226 nm in case of the former, while at 400 nm for latter. Other products NO₂⁻ and H₂O₂ were identified and estimated by wet-chemical sampling methods followed by colorimetric analyzes, respectively, at 540 and 350 nm. NO,NO₂, and NO₂⁻ yields increased continuously, with increase in gas residence time inside the plasma zone, applied voltage between two electrodes, and the moisture concentration in the gas stream. Typical G values estimated are: NO, 3.98 × 10⁻³; total NO₂ and NO₂⁻ , 6.30 × 10⁻³; and H₂O₂, 2.7 × 10⁻³ μmol · J⁻¹. In the product mixture, employing NO₂ and NO₂⁻ absorber solution, 50–750 ppm level NO was obtained as an exclusive product with 0.05–24 kHz ac power supplies.