Health authorities have raised serious concerns after reports of unusual “black rain” in parts of Iran following recent strikes on oil infrastructure. The World Health Organization has warned that toxic compounds released into the air from burning oil facilities could pose immediate and long-term health risks to the population.
The phenomenon reportedly occurred after attacks damaged refinery infrastructure, releasing pollutants that mixed with rainfall and fell as dark, oil-laden droplets. Health experts say the contamination could trigger respiratory problems, skin irritation, and other health complications. Authorities in Iran have already advised residents to stay indoors and limit outdoor exposure while air quality conditions remain hazardous.
The unusual “black rain” event was reported after strikes targeted oil storage facilities and refineries in Tehran and nearby regions. The attacks caused large fires and released heavy smoke and chemical particles into the atmosphere.
As these pollutants spread across the air, rainfall interacting with the contaminated atmosphere produced dark droplets carrying oil-based residues and chemical compounds.
Officials at the World Health Organization confirmed that multiple reports of oil-tainted rain had been received during the week. The organization warned that such pollution could pose immediate health hazards to people exposed to the contaminated air and rain.
On Monday, thick black smoke reportedly covered parts of Tehran after an oil refinery was struck, raising serious concerns about air quality and public health in the densely populated city.
Health experts say this type of environmental contamination is often associated with industrial fires or large-scale oil facility damage.
During a media briefing in Geneva, WHO spokesperson Christian Lindmeier emphasized that the contaminated rainfall and air pollution present a potential health threat.
According to the organization, the smoke and pollutants released by burning oil infrastructure contain a mix of hazardous compounds that can affect respiratory health.
Authorities in Iran have urged citizens to remain indoors whenever possible, particularly in areas where air pollution levels are high.
The WHO supported this recommendation, stating that limiting outdoor exposure could significantly reduce the risk of inhaling harmful particles.
Officials also suggested that individuals who must go outside should take precautions such as wearing protective masks and covering exposed skin.
These measures are commonly recommended in situations where air quality deteriorates due to industrial accidents or environmental disasters.
Scientists and health experts say the destruction of oil storage infrastructure can release a range of hazardous chemicals into the air.
According to the WHO, fires at oil facilities may release large quantities of:
Hydrocarbons
Sulfur oxides
Nitrogen compounds
These pollutants are known to cause irritation and respiratory complications when inhaled.
Exposure to smoke and contaminated rainwater can lead to symptoms such as headaches, coughing, eye irritation, and skin inflammation.
Experts warn that direct contact with contaminated droplets may also trigger allergic reactions or chemical burns in sensitive individuals.
While short-term exposure may cause temporary health issues, prolonged exposure to certain toxic compounds can increase the risk of chronic respiratory diseases and even certain cancers.
Environmental contamination caused by oil fires has been documented in several previous industrial incidents around the world.
One video reportedly shared by a WHO staff member showed dark liquid collecting at the entrance of a WHO office building in Tehran on March 8.
The footage showed personnel cleaning the oily substance from the ground, highlighting the unusual nature of the rainfall and its potential environmental impact.
Such incidents underscore the scale of pollution that can occur when industrial facilities burn for extended periods.
Airborne soot particles and chemical residues can travel long distances before being washed down by rainfall, creating hazardous conditions for residents.
Environmental monitoring is typically required after such events to assess soil contamination, water pollution, and long-term health risks.
Climate and atmospheric scientists say the black rain phenomenon occurs when rainwater mixes with large amounts of airborne pollution.
According to Akshay Deoras, a research scientist at University of Reading, rainfall likely combined with smoke particles and soot released during the refinery fires.
The resulting mixture formed dark rain droplets containing pollutants.
He noted that such events can serve as a visible reminder of the level of pollution present in the air.
However, scientists stress that the greater concern may be the toxic particles that remain suspended in the atmosphere.
Prolonged exposure to polluted air can pose more serious health risks than occasional contact with contaminated rain.
To minimize exposure, experts recommend limiting outdoor activity and wearing protective masks in heavily polluted environments.
Air quality in affected regions depends largely on weather patterns and whether additional industrial damage occurs.
Scientists say that if fires are contained and no new attacks occur, pollution levels should gradually decline as atmospheric conditions disperse the contaminants.
Weather forecasts indicate that dry conditions may persist in the region for several days, which could help reduce the spread of contaminated rainfall.
However, experts warn that new strikes on oil facilities could release additional pollutants, worsening air quality and prolonging health risks.
Environmental authorities often monitor such situations closely using air quality sensors and satellite data.
Public health officials also continue to track potential medical cases related to pollution exposure.
For now, experts emphasize the importance of precautionary measures and public awareness to minimize health risks during the crisis.