<div>The Open access to Mars Assimilated Remote Soundings (OpenMARS) database is a reanalysis product combining past spacecraft observations with a state-of-the-art Mars Global Circulation Model (GCM). The OpenMARS product is a global surface/atmosphere reference database of key variables for multiple Mars years.<br></div><div><br></div><div>Spacecraft observations of temperature, dust, water vapour and ozone from multiple different spacecraft are combined with a Mars GCM used at the Open University. <br></div><div><div><br></div><div>Extended details on the datasets can be found in the reference manuals included with each separate repository.<br></div><div><br></div></div>This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 633127.