March 16 , 2026
14 hrs 0 min
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- Tehran experienced “Black Rain” after fires at oil facilities during the Israel–Iran conflict released pollutants into the atmosphere.
- Black rain is rainfall contaminated with soot, ash, oil particles, and industrial chemicals from large fires or explosions.
- It forms when rain passes through polluted air containing smoke, hydrocarbons, sulphur oxides, and nitrogen compounds.
- The World Health Organization (WHO) warned that it may cause breathing problems, skin irritation, headaches, and chemical burns.
- Long-term exposure to chemicals like benzene can increase the risk of cancer.

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