As part of the preparations for the Sentinel-5 Precursor air-quality monitoring mission, scientists teamed up in Romania recently to test different airborne systems that will be used to ensure this new satellite delivers accurate measurements of pollutants in the air we breathe.

With air pollution linked to millions of deaths around the world, it has never been more important to monitor the air we breathe. Today marks a significant step forward as a deal is secured to build a crucial space sensor for tracking the world's air quality.

A large volcanic OClO and BrO plume could be tracked from ENVISAT SCIAMACHY jointly with EOS Aura MLS and OMI observations for 5 days after the June 2011 eruption of Puyehue-Cordón Caulle (PCC).

Since its latest series of deadly eruptions, Java’s Mt Merapi has been spewing volcanic ash clouds into the air. Satellite data are crucial for assessing the eruption’s danger to air traffic and public safety.