Mayon Volcano continued to push lava from its summit crater and release massive volumes of sulfur dioxide gas in May 2026, forcing tens of thousands of residents in Albay province to remain in evacuation shelters with no clear timeline for return. The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported SO2 emissions reaching 2,785 tonnes per day, a figure widely cited in agency updates and consistent with satellite observations of thick volcanic plumes drifting over the Bicol region. PHIVOLCS held its alert at Level 3, meaning magma is at or near the crater and a hazardous eruption remains possible within weeks.
The combination of steady lava effusion, elevated gas output, and intermittent ashfall has placed communities across at least six municipalities surrounding the volcano, including Daraga, Camalig, Guinobatan, Malilipot, Santo Domingo, and Legazpi City, under layered threat. For residents closest to the cone, the danger is direct: slow-moving lava, rockfalls, and the ever-present risk of pyroclastic density currents if activity escalates. For those farther downwind, volcanic ash and sulfur-laden air pose respiratory hazards and threaten crops, livestock, and water supplies.
Satellite and ground data confirm sustained eruption
PHIVOLCS has been publishing ground-based sulfur dioxide flux measurements throughout the current eruption phase, drawing on a network of spectrometers positioned around the volcano. Those readings are independently supported by satellite instruments. NASA Earth Observatory detected SO2 plumes drifting from Mayon, providing a second line of evidence that large volumes of sulfur-rich gas are escaping the conduit, a pattern consistent with fresh magma rising toward the surface.
Ashfall has already blanketed populated areas. The Philippine Space Agency (PhilSA) used Sentinel-2 imagery captured on May 3, 2026, compared against a baseline image from April 28, 2026, to map ashfall deposits across barangays in Albay. PhilSA later published a correction note on the satellite imagery dates but confirmed the core finding: ash had settled on communities downwind of the crater, coating rooftops, roads, and farmland.
Aviation hazards added another layer of disruption. NOAA’s Volcanic Ash Advisory Center (VAAC) issued formal volcanic ash advisories around May 8 and 9, 2026, recording ash cloud altitudes and drift patterns relevant to flight safety. Those advisories confirmed that plumes reached altitudes high enough to trigger warnings for aircraft transiting Philippine airspace near the Bicol corridor.
Key questions still without clear answers
Despite the volume of monitoring data, several important details remain unresolved. The 2,785-tonnes-per-day SO2 figure, while widely reported, has not been matched to a specific dated PHIVOLCS bulletin in publicly accessible records reviewed for this report. NASA satellite observations corroborate the presence of large SO2 plumes, but the exact daily tonnage and the measurement methodology behind it have not been independently confirmed through the primary documents currently available. The number should be treated as reported by PHIVOLCS but not yet cross-verified through a published bulletin.
How far lava has traveled down Mayon’s flanks is another open question. Reports have described flows advancing into river drainages such as the Bonga and Mi-isi gullies, raising concern about lahars once heavy monsoon rains arrive. But the primary satellite and advisory sources reviewed here do not specify a precise lava-flow length. Confirmation would require PHIVOLCS field measurements or high-resolution thermal imagery not yet publicly released.
Health impacts on affected communities are similarly undocumented in primary sources. Prolonged exposure to volcanic SO2 and fine ash particles can irritate airways, aggravate asthma and other respiratory conditions, and contaminate drinking water. No official PHIVOLCS or Department of Health statement on community health outcomes has surfaced in the materials reviewed. The VAAC advisories address aviation risk, not ground-level air quality, so they offer only indirect evidence of the broader hazard.
Whether the eruption will escalate or gradually wind down is genuinely unknown. Alert Level 3 does not guarantee a larger explosion is coming, but it does not rule one out. Mayon’s history shows it can shift rapidly between quiet degassing, steady lava effusion, and violent explosive episodes. Its 2018 eruption followed a similar pattern of escalation: weeks of lava flows and elevated SO2 preceded sporadic explosions that sent ash columns kilometers into the sky and displaced more than 80,000 people at peak evacuation.
Life in the evacuation centers
For the families sheltering in schools, gymnasiums, and government buildings across Albay, the eruption has become an exercise in waiting. Evacuations that began as short-term precautions have stretched into weeks, straining shelter capacity, food supplies, and patience. Farmers whose fields sit inside the extended danger zone face the prospect of losing an entire planting season. Fishermen from coastal barangays near Legazpi City, while outside the direct lava threat, contend with ashfall that fouls nets and gear.
Local disaster risk reduction and management offices (DRRMOs) have been coordinating relief distribution, but sustaining operations over a prolonged displacement period tests municipal budgets. The National Disaster Risk Reduction and Management Council (NDRRMC) typically consolidates evacuee counts and relief data during extended volcanic crises, though updated figures for the current phase have not been published in the sources reviewed here.
Clear communication from authorities about why the alert level has not been lowered, even during stretches without dramatic explosions, is critical to maintaining public cooperation. Residents who see a quiet-looking volcano from their shelter windows may question why they cannot return home. The answer lies in the SO2 data and seismic readings that indicate magma remains active beneath the surface, a reality invisible to the naked eye but measurable by instruments.
What Mayon’s history tells us
Mayon is the most active volcano in the Philippines, with more than 50 recorded eruptions since 1616. Its near-perfect cone, a defining feature of the Albay landscape, is itself a product of frequent eruptions that deposit layer upon layer of lava and ash. The volcano’s steep slopes make it especially prone to fast-moving pyroclastic flows and lahars, which have historically caused the most fatalities.
The 2018 eruption is the most recent major comparison point. That event began with phreatic (steam-driven) explosions in January 2018, escalated to lava fountaining and effusive flows by late January, and prompted PHIVOLCS to raise the alert to Level 4 before activity gradually declined. At its peak, more than 80,000 residents were displaced. The current 2026 episode has not reached Level 4, but the sustained SO2 output and continuous lava effusion suggest the magmatic system remains pressurized.
Earlier eruptions, including a deadly 1993 event that killed 77 people when pyroclastic flows swept through barangays on the southern slopes, underscore why PHIVOLCS maintains conservative danger-zone boundaries. The permanent danger zone extends six kilometers from the summit; the extended danger zone can be pushed farther depending on the eruption’s character and prevailing wind direction.
What residents and travelers should know now
As long as PHIVOLCS maintains Alert Level 3, the permanent danger zone remains strictly off-limits, and communities in extended danger zones should follow local government evacuation orders without exception. Residents within ashfall range should monitor PHIVOLCS bulletins for any change in alert status, keep N95 masks and eye protection accessible, and take steps to protect water supplies from contamination. Practical measures include storing drinking water in sealed containers, clearing roof gutters to prevent ash-clogged drainage, and limiting outdoor activity during periods of heavy ashfall.
Travelers flying through Bicol-area airports, including Legazpi’s Daraga Airport, should check airline advisories and expect possible disruptions when ash plumes are active. NOAA VAAC advisories, updated multiple times daily during eruption phases, provide the most current information on ash cloud positions and altitudes.
For everyone watching Mayon from a distance, the most important thing to understand is that uncertainty is not a failure of science but a feature of volcanic crises. PHIVOLCS can describe what the volcano is doing now with increasing precision, but no agency anywhere in the world can predict exactly when a sustained eruption will end or whether a more explosive phase will follow. Preparedness grounded in verified information, not rumors or social media speculation, remains the strongest protection for communities living on the slopes of one of the world’s most closely watched volcanoes.
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*This article was researched with the help of AI, with human editors creating the final content.
