An international team of researchers has determined the chemical processes behind the formation of atmospheric formic acid, which will lead to improved weather and climate models.

Australian fires in 2019 and 2020 injected almost 1 million metric tons of smoke into the stratosphere, causing it to warm and likely contributing to a large and persistent ozone hole.

Lockdowns last year in response to COVID-19 resulted in drastic cuts to emissions, especially from vehicle tailpipes, and yet some urban areas saw a paradoxical spike in ozone air pollution.

Ozone in the lower atmosphere fell by 7% on average across the Northern Hemisphere, new research finds.

Pieternel Levelt has been selected to lead the Atmospheric Chemistry Observations & Modeling Laboratory (ACOM) at the National Center for Atmospheric Research (NCAR). Levelt currently serves as the head of the R&D Satellite Observations department at The Royal Netherlands Meteorological Institute while also serving as a professor at Delft University of Technology.