Collision integrals (transport cross sections) for atomic and molecular interactions of importance in high‐temperature air are calculated based on accurate force laws which have recently become available. The tabulations include the collision integrals for diffusion, viscosity, and thermal conductivity, and the collision integral ratiosA*,B*, andC* needed for mixture calculations, and cover the range from 1000° to 15 000°K for the major interactions N&sngbnd;N, O&sngbnd;O, N&sngbnd;O, N&sngbnd;N2, O&sngbnd;O2, O&sngbnd;N2, N2&sngbnd;N2, O2&sngbnd;O2, and N2&sngbnd;O2. Average potential energy functions, but no collision integrals, are given for the minor interactions O&sngbnd;NO, O2&sngbnd;NO, N2&sngbnd;NO, and NO&sngbnd;NO. The calculations all refer to atoms and molecules in their ground states only. Calculational errors are estimated to be about 5% over the temperature range, but may occasionally rise as high as 10%. The relative magnitudes of the average collision integrals are discussed briefly for their bearing on the qualitative behavior of the corresponding gas mixtures, and on the assessment of the errors involved in some approximations commonly used in calculations of transport properties of air.