Toxic "Black Rain" over Tehran as the Shahran oil depot burned

TEHRAN — Massive fires continued to burn at oil storage facilities in the Iranian capital after a series of military strikes hit key fuel infrastructure, triggering a growing environmental crisis and raising concerns about toxic fallout across the region. 

Thick black smoke from the blazes at sites including the Shahran oil depot has blanketed large parts of the city, while residents and officials report contaminated rainfall and severe air pollution affecting millions of people. 

The attacks targeted several petroleum storage and refinery facilities in and around Tehran, marking a significant escalation in the ongoing conflict. Fires broke out across multiple fuel depots, sending towering plumes of smoke into the sky and causing extensive damage to infrastructure central to Iran’s energy distribution system. 

Photo Credit:

AI generated illustration. Executed by Chat GPT from a prompt by Bjorn Ulfsson, CTIF. 

Major Oil Infrastructure Fires

Among the most heavily affected sites is the Shahran oil depot, a major fuel storage facility north of Tehran that supplies a significant portion of the capital’s gasoline and petroleum needs. The depot contains multiple large storage tanks and typically holds several days’ worth of fuel reserves for the city. 

Video reports from journalists on the ground have shown massive flames rising from the storage tanks, with thick black smoke drifting across residential districts. The fires burned for hours after the strikes, contributing to severe air pollution across the metropolitan area, which is home to nearly 10 million people. 

Residents described scenes resembling an industrial disaster, with the skyline obscured by smoke and emergency crews struggling to contain the fires. Authorities warned that the burning fuel released large quantities of hydrocarbons and other pollutants into the atmosphere. 

Environmental and Health Concerns

Environmental experts say the destruction of fuel depots could produce widespread contamination of air, water, and soil. Large-scale oil fires release soot, sulfur compounds, nitrogen oxides, and other toxic substances that can travel long distances in the atmosphere. 

Satellite and atmospheric models suggest that smoke plumes from the Tehran fires could spread beyond Iran’s borders, potentially affecting air quality in neighbouring regions. Some meteorological agencies in South Asia have already warned that pollution from the fires could drift eastward under certain wind patterns. 

In addition to airborne pollution, experts warn that oil runoff from damaged storage tanks could contaminate drainage systems and waterways in and around the capital. Oil spills entering stormwater networks may carry toxic residues far beyond the immediate blast zones. 

“Black Rain” Over Tehran

One of the most alarming consequences reported after the strikes has been the phenomenon residents are calling “black rain.”

Following the fires, heavy smoke filled the sky above Tehran, and precipitation falling through the polluted air reportedly became saturated with soot and oil particles. Residents said that dark, oily droplets stained cars, balconies, and streets across large parts of the city. 

Witnesses described waking up to vehicles and buildings coated with black residue after overnight rainfall. One resident told reporters the rain had turned their freshly washed white car almost completely black. 

Authorities warned that the contaminated rainfall could be dangerous. The Iranian Red Crescent cautioned that exposure to polluted precipitation could lead to respiratory problems, skin irritation, or chemical burns due to toxic compounds released by burning petroleum products. 

Scientists say the phenomenon resembles “black rain” events documented after large industrial fires or major explosions, where soot and ash mix with rainwater as it falls through smoke-filled air. 

Wider Industrial and Economic Impact

Beyond the immediate environmental effects, the strikes have also disrupted fuel distribution across the capital. Officials temporarily limited gasoline purchases as supply systems struggled to cope with damage to storage facilities. 

Energy analysts warn that sustained damage to Iranian fuel depots and refineries could ripple through global oil markets if production or distribution remains impaired. Observers have already reported rising crude prices amid fears that attacks on energy infrastructure could escalate further. 

Uncertain Long-Term Consequences

Experts say the full environmental impact of the fires may take months or years to assess. Long-range transport of smoke particles could affect ecosystems, crops, and water supplies far from Tehran, while toxic residues may linger in urban environments after the fires are extinguished. 

For now, residents in the Iranian capital continue to face hazardous air conditions and uncertainty about the scale of contamination following one of the largest attacks on the country’s energy infrastructure in recent years.