In view of the importance of air in science and technology and the abundance of experimental data, we present in this report a consistent set of critically evaluated data and an up‐to‐date correlation of the viscosity and the thermal conductivity of air in the gaseous phase over a wide range of temperature and pressure. This is especially important for the viscosity, since the recent data show systematic differences compared with the old standard value used for many years. The present paper was written in order to document the critical evaluation of the latest data sets and to present a new set of correlations of the viscosity and the thermal conductivity of air. The range covered is from 85 to 2000 K for temperature and up to 100 MPa for pressure.