Farewell to a pioneering pollution sensor
(PHYSorg.com Space & Earth)

On Jan. 31, NASA ended the Tropospheric Emission Spectrometer`s (TES) almost 14-year career of discovery. Launched in 2004 on NASA`s Aura spacecraft, TES was the first instrument designed to monitor ozone in the lowest layers of the atmosphere directly from space. Its high-resolution observations led to new measurements of atmospheric gases that have altered our understanding of the Earth system.