The Alaska Volcano Observatory has decided to lower the alert level for Cleveland volcano.

The volcano has erupted 21 times in the last year, with the latest hiccup on August 19 sending up a small ash cloud that dissipated quickly. In a statement, the Observatory said that there have been no signs of fresh lava in the summit crater since May and that based on that, it’s possible the volcano is quieting down. Cleveland lies on a major international flight path and any eruptions could disrupt air traffic. The aviation alert level is now at yellow.