The Philippine Institute of Volcanology and Seismology (Phivolcs) issued a warning on Friday as it monitored the presence of volcanic smog at Taal Volcano in Batangas, causing concerns about potential health risks and harm to the environment.

In the past 24 hours as of 5AM, Friday, Phivolcs observed the presence of smog and documented five volcanic tremors, lasting from 20 to 575 minutes, suggesting increased activity within Taal.

State volcanologists monitored an upwelling of hot volcanic fluids in the Main Crater Lake, causing steam plumes to rise as high as 2,400 meters, drifting in the west-southwest and southwest direction.

Volcanic sulfur dioxide (SO2) gas emissions from the Taal Main Crater reached a daily total of 4,569 tons while a large cloud of SO2 was also spotted west of Taal Lake on Thursday.

“Smog has been affecting the Taal region since the first week of September 2023 as an average of 3,402 tons per day SO2 has been degassed from Taal Volcano for the month,” Phivolcs said.