Flights to Puerto Montt in Southern Chile are being canceled, as airways have been affected by the eruption of ​ ​Calbuco volcano in Chile​, which is spewing dangerous plumes of ash into the air.

​The most recent relevant activity from the volcano occurred in August of 1972. According to a recent report produced by Chile’s national geological service, El Servicio Nacional de Geología y Minería (Sernaageomin), the volcano was listed as the third most dangerous of 90 active volcanoes in Chile.

Sernaageomin has declared a “code red,” which signifies “a high threat to the population.”

After 43 years of inactivity, the​ ​volcano erupted at 3:11pm local time, with a force registering 2.5 on the Richter scale, according to Chile’s official Volcano monitoring service,​ ​Observatorio Volcanológico de Los Andes del Sur (OVDAS).​ ​The eruption can be seen from 12 miles away.