Calculated values of the viscosity, thermal conductivity, and electrical conductivity of argon, nitrogen, and oxygen plasmas, and mixtures of argon and nitrogen and of argon and oxygen, are presented. In addition, combined ordinary, pressure, and thermal diffusion coefficients are given for the gas mixtures. These three:combined diffusion coefficients fully describe diffusion of the two gases, irrespective of their deg,ee of dissociation or ionization. The calculations, which assume local thermodynamic equilibrium, ave performed for atmospheric-pressure plasmas in the temperature range from 300 to 30,000 K. A number of the collision integrals used in calculating the transport coefficients are significantly more accurate than values used in previous theoretical studies, resulting in more reliable values of the transport coefficients. The results are compared with those of published theoretical and experimental studies.