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Toxic Rain in Iran Highlights Environmental Cost of War

Airstrikes on Iranian oil facilities caused toxic rain containing soot and heavy metals, prompting health warnings as residents report respiratory symptoms, the WHO said.

  • Toxic smoke from U.S.-Israeli airstrikes on Iranian oil facilities returned to Earth as "black rain" near Tehran last week, with residents reporting burning eyes and difficulty breathing.
  • Plumes of dark smoke have spread across the region during two weeks of war as Iran retaliates against airstrikes by targeting Persian Gulf oil and natural gas infrastructure.
  • Burning oil releases microscopic soot particles about 40 times smaller than a human hair, which can lodge deep in lungs and enter the bloodstream, according to Peter Adams, a civil and environmental engineering professor at Carnegie Mellon University.
  • The World Health Organization and local officials advised residents to stay indoors and wear masks, while V. Faye McNeill, a chemical engineering professor at Columbia University, warned of acute health effects from the toxic exposure.
  • While soot disperses within three to seven days, Adams cautioned that long-term health risks persist and "we don't know what's going to happen with future strikes and whether other tanks will be struck.
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Clouds of toxic smoke, which rose into the atmosphere due to US-Israeli attacks on Iranian oil companies, have descended on the ground in the form of "black rain", posing serious risks to public health. Residents of Tehran have already complained of some health problems, so experts are recommending precautions.

·Ljubljana, Slovenia
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Numerama broke the news in on Saturday, March 14, 2026.
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