Nature often operates on a timescale that humans struggle to comprehend. But this week, geology fast-forwarded into our daily lives. On November 23, 2025, the Hayli Gubbi volcano—a shield volcano in Ethiopia’s remote Afar region—shattered a 10,000-year silence.
While the eruption occurred on the African continent, the ripple effects were felt thousands of miles away across the Arabian Sea. From flight cancellations in Mumbai to milky skies over Rajasthan, the event served as a stark reminder of our planet’s interconnected weather systems.
In this deep dive, we explore the science behind the eruption, the trajectory of the ash plume, and why, despite the aviation chaos, India’s air quality remained surprisingly safe.
The Awakening: A Geological Event 10 Millennia in the Making
The Hayli Gubbi volcano is located in the northern part of the Main Ethiopian Rift, a hotbed of tectonic activity. For millennia, it has been a dormant feature of the landscape. However, seismic activity began to spike in mid-November 2025, culminating in a violent eruption on the 23rd.
Unlike the slow lava flows often depicted in movies, this event was characterized by a massive explosive column. The volcano ejected tons of volcanic ash and sulfur dioxide (SO2) high into the stratosphere.
Why This Matters
Rarity: Eruptions after such long dormancy periods are unpredictable and often violent.
Location: The Afar region is a critical junction for global weather patterns moving East.
The Transcontinental Journey: Tracking the Ash Cloud
How does an eruption in East Africa affect a flight in New Delhi? The answer lies in the Subtropical Jet Stream.
Immediately following the eruption, strong high-altitude winds caught the volcanic plume. Instead of settling locally, the ash was transported rapidly eastward. The trajectory was a meteorological marvel:
Crossing the Red Sea: The plume exited African airspace within hours.
The Arabian Peninsula: It drifted over Oman and Yemen, thinning out but remaining cohesive.
Arrival in India: By late November, the cloud entered the Indian subcontinent via the Arabian Sea, blanketing Western and Northern India.
Aviation Chaos: Why Flights Were Grounded
For travelers, the geological spectacle quickly turned into a logistical nightmare. Between November 25 and 28, India’s aviation sector faced significant disruptions.
Volcanic ash is kryptonite for jet engines. It is not soft dust; it is comprised of jagged particles of glass and rock. If ingested by a jet engine, the heat melts the ash, which then resolidifies on the turbines, causing engine failure.
The Impact on Indian Airlines
Because the ash cloud settled at cruising altitudes—specifically between 15,000 and 45,000 feet—airspace corridors heading West became hazardous.
Major Disruptions: Airlines, including Air India, Akasa Air, and IndiGo, were forced to cancel or divert dozens of flights.
Affected Routes: The primary disruptions hit flights connecting India to the Middle East, Europe, and the United States.
Safety Protocols: While frustrating for passengers, these cancellations were a mandatory safety protocol. Pilots cannot fly "over" or "under" such a dispersed layer safely.
The Atmosphere vs. The Ground: Debunking the "Toxic Smog" Myth
Perhaps the most confusing aspect of the Hayli Gubbi event for Indian residents was the disconnect between the news reports and the air they were breathing.
With Delhi’s winter pollution already a hot topic, panic spread regarding a "double whammy" of smog and volcanic ash. However, meteorological data reveal a reassuring truth.
The Vertical Divide
The volcanic material remained trapped in the Upper Troposphere.
High Altitude: The ash stayed above 5 kilometers.
Ground Level: The air at street level remained untouched by volcanic particulates.
Did the AQI Worsen?
No. The Central Pollution Control Board (CPCB) and independent monitors confirmed that the Air Quality Index (AQI) in Delhi, Mumbai, and Ahmedabad did not spike due to the volcano. The pollution on the ground was, unfortunately, our own, unrelated to the Ethiopian giant.
Visuals: A Hazy Spectacle in the West
While the air remained safe to breathe, the sky told a different story. Residents in Gujarat and Rajasthan witnessed atmospheric optical phenomena rare for the region.
Milky Skies: During midday, the usual crisp blue of winter was replaced by a pale, milky haze.
Dimmer Sunsets: The most striking visual was the scattering of sunlight. Sunsets appeared dimmer and diffused, turning the horizon a strange, muted orange. This "volcanic twilight" is caused by aerosols scattering sunlight before it reaches the ground.
Current Status: Clear Skies Returning
As we approach the end of November 2025, the situation has normalized. The prevailing winds have pushed the bulk of the ash cloud out of Indian airspace.
Trajectory: The plume is currently drifting over parts of China and dissipating into the wider atmosphere.
Flight Operations: Indian Airlines has resumed normal schedules for westbound flights.
Health Check: There remains no long-term health risk from this event for people on the ground in India.
The eruption of Hayli Gubbi was a fascinating reminder of nature's power to disrupt our modern lives. It connected continents through wind and fire, grounding our fastest machines while painting our skies in new colors.
Frequently Asked Questions (FAQ)
Q: Is the volcanic ash in India dangerous to breathe?
A: No. The ash from Hayli Gubbi remained in the upper atmosphere (above 15,000 feet). It did not descend to ground level, so it posed no respiratory threat to people in India.
Q: Why were flights cancelled if the air on the ground was fine?
A: Commercial jets cruise at the exact altitude (30,000–40,000 feet) where the ash cloud was floating. Volcanic ash can destroy jet engines, making it unsafe to fly through even thin layers.
Q: Will the Hayli Gubbi volcano erupt again soon?
A: Geologists are monitoring the situation in the Afar region. While the initial explosive phase has ended, aftershocks and smaller emissions are possible, though unlikely to impact India again immediately.