The Philippine Institute of Volcanology and Seismology (Phivolcs) said that Taal Volcano’s degassing activity has once again produced volcanic smog, or “vog,” during its latest 24-hour monitoring of the active volcano in Batangas.

In its Taal Volcano bulletin issued on Tuesday, Aug. 27, Phivolcs said that sulfur dioxide (SO2) emissions from the active volcano in Batangas were at 2,921 tons per day.

Phivolcs said the upwelling of hot volcanic fluids also continues in the main crater lake, producing vog.

It also observed a “voluminous” plume emission reaching 1,800 meters above the crater before drifting north-northwest and north.

Just last week, Taal Volcano’s degassing activity and prevailing wind direction led to hazy conditions in surrounding communities, prompting some areas to cancel classes.

Phivolcs warned that prolonged exposure to volcanic SO2 can irritate the eyes, throat, and respiratory tract, particularly for individuals with preexisting health conditions such as asthma, lung disease, and heart disease, as well as for the elderly, pregnant women, and children

The agency advised at-risk communities to limit their exposure to volcanic SO2.

Phivolcs reminded the public that Alert Level 1 (low-level unrest) is in effect for Taal Volcano, signaling abnormal conditions.

This level indicates risks of sudden steam-driven or phreatic explosions, volcanic earthquakes, minor ashfall, and hazardous volcanic gas emissions, especially on Taal Volcano Island (TVI).

Continuous high concentrations of volcanic SO2 pose a concern for long-term health impacts on nearby communities.

Phivolcs recommended avoiding entry to TVI, particularly near the Main Crater and Daang Kastila fissure, which are considered permanent danger zones.

Local government units are advised to monitor SO2 levels, assess their effects, and implement measures to mitigate these hazards.