This document describes the atmospheric data sets exploited in INTAROS WP2. These include in-situ particulate absorption, remote-sensing cloud products and total integrated water vapor from satellites. This document is intended to describe solely the data sets upgraded and the methodologies used. The requirements for the data collections and the assessment of the upgraded products are presented in D2.4 Sections 3—5 jointly with the assessment of existing data sets presented in D2.4 Section 2.