Air plasma, not contaminated by vapours released from the electrodes. The plasma chemistry involves 11 species (e, N2, O2, NO, N, O, N2+, O2+, NO+, N+, and O+). It is assumed that the plasma behaves like a fluid, in which the heavy particles (neutrals and ions) are in thermal equilibrium at a common temperature T, while the electrons are characterized by a Maxwellian velocity distribution function with a temperature Te.