The Atmospheric Limb Tracker for Investigation of the Upcoming Stratosphere (Altius) satellite platform and solar array structural and thermal model in construction and on a vibration shaker in 2019. Carrying an instrument that images in the ultraviolet, visible and near-infrared channels, Altius will provide profiles of stratospheric ozone. It will also measure other atmospheric trace gases such as nitrogen dioxide and aerosols that affect air quality.