This data is published to be companion to the peer-reviewed paper submitted to Earth and Space Science named “Ground-Based Far Infrared Emissivity Measurements Using the Absolute Radiance Interferometer”. This paper describes the data collection process and emissivity derivation technique in detail. The data included here are the single channel and microwindow emissivities which have been derived from the PC-noise-filtered ARI radiance measurements from the 2022 measurement campaign.