A mixture of volcanic ash and sulphate gas spewed from Europe’s most active volcano, Etna, reached Greece.

Etna “woke up” again on Monday evening, July 22, and the volcano’s activity peaked yesterday, July 23, at 10:30 a.m. Greece time.

A mixture of volcanic ash and sulphate gas reached over Attica and the northern part of Peloponnese, up to eight kilometers above sea level, according to the Institute of Astronomy, Astrophysics, Space Applications and Remote Sensing of the Athens National Observatory.

The institute noted in a post on social media that it is monitoring the phenomenon, as low ash and gas clouds are affecting the signal of the Observatory’s PollyXT lidar system operating at the PAGAIA Observatory.

The Institute has developed an early warning system for the transport of volcanic ash and sulphate suspensions and through data processing is able to provide forecasts of these phenomena.