Timeline of Events
March 7–8, Night
Israeli strikes hit 4 oil storage facilities in Tehran & Alborz province
March 8, Morning
Black oily rain falls across Tehran, coating cars, clothes, and skin
March 9–10
Residents report headaches, bitter taste, and burning smell across the city
March 11
WHO warns of real danger to respiratory health, backs indoor advisory
Targeted Facilities
Aghdasieh oil warehouse (NE Tehran)
Tehran refinery (South Tehran)
Oil production centre, Alborz province
As rain moved through pollutant-saturated skies, it absorbed toxic hydrocarbons, sulfur oxides, and nitrogen compounds — falling as oily, blackened precipitation. Tehran's mountain ring trapped pollutants inward, compounding the danger.
Click each compound to reveal health risks
Hydrocarbons
Headaches, dizziness, long-term cancer risk
Reveal health risk
Benzene
Extremely toxic; severe long-term consequences
Reveal health risk
Sulfur Oxides
Respiratory damage, acid rain formation
Reveal health risk
Nitrogen Oxides
Lung irritation, smog formation
Reveal health risk
Forever Chemicals
Groundwater contamination, persists for decades
Reveal health risk
WHO Advisory
The WHO warned that black rain and acidic rain falling over Tehran pose a real danger primarily to respiratory health. Residents were advised to remain indoors. The Iranian Red Crescent warned of potential serious lung damage and chemical burns to skin.
Testimonies from Tehran
"
I sat at home with a headache and a bitter taste in my mouth.
— Anonymous resident
The black rain crisis may outlast the fires.
Forever Chemicals
critical
Flame retardants built into facilities likely released PFAS compounds that contaminate groundwater, become airborne, and re-enter the rain cycle — persisting for decades.
Infrastructure Corrosion
high
Acid rain will accelerate corrosion of buildings already weakened by Tehran's chronic air quality problems. Damage to city infrastructure is expected to compound over years.
Food Chain Contamination
high
The Conflict and Environment Observatory warns of vegetation contamination exposing humans and animals to toxic compounds through the food chain.
Groundwater Threat
ongoing
Toxic petroleum compounds and heavy metals have seeped into soil. Tehran's water table faces long-term contamination risk. Effects may not surface for years.
Sources: WHO · Iranian Red Crescent · Conflict and Environment Observatory · NBC News · CBC News · Time · BBC