The SAGE III instrument is used to study ozone, a gas found in the upper atmosphere that acts as Earth’s sunscreen. More than 25 years ago, scientists realized there was a problem with Earth’s thin, protective coat of was thinning. The SAGE family of instruments was pivotal in making accurate measurements of the amount of ozone loss in Earth's atmosphere. SAGE has also played a key role in measuring the onset of ozone recovery resulting from the internationally mandated policy changes that regulated chlorine-containing chemicals, the Montreal Protocol, which was passed in 1987.


Today, the SAGE technique is still the best for the job, and NASA scientists are preparing to send the third generation of the instrument into space. However, not just any spacecraft will do for SAGE III. Scientists have been keeping it safe, waiting for the day that it could go where no continuous Earth-observing instrument has gone before – the International Space Station (ISS).

Image - SAGE III on ISS Press Kit cover Image

SAGE III / ISS  Fact Sheet

SPACE-X 10 Mission Patch

NEWS: Apr 7, 2014

Robert Lightfoot gets SAGE III update, holds town hall


From left: NASA Langley's Center Director Steve Jurczyk, NASA Chief Technologist David Miller and NASA Associate Administrator Robert Lightfoot listen as SAGE III chief engineer Joe Gasbarre describes a model of the SAGE III instrument, which is scheduled to go to the ISS in 2015. Image Credit:

NASA/David C. Bowman

April 10, 2015

The Interface Adapter Module, which is like the "brains" of SAGE was delivered for integration with the instrument.

March 10, 2015

The Mission Operations team successfully completed the Mission Operations Long Duration Test at the new Flight Mission Support Center

March 11, 2015

The Hexapod Pointing System, which will help keep SAGE pointed in the right direction, was installed with the instrument. The team is working hard to get SAGE ready for environmental testing and then launch!

Feature: May 19, 2015

SAGE III on ISS Surges Past Integration and Pre-environmental Reviews


SAGE III on iSS Overview - Video

NASA-X Feature

SAGE III on iSS Overview - Video

Patch - Space-X 10 Mission Patch

September 8, 2014

Preparing SAGE III for ISS

Jamie Nehrir, lead instrument operator, smiles next to SAGE III/ISS at NASA's Langley Research Center in Hampton, VA.

February 25, 2015

European Space Agency Delivers Earth-observing Component to NASA


January 14, 2015

NVP Completes Final Pre-ship Inspection & Cleaning