Clouds of toxic smoke unleashed into the atmosphere by U. S. -Israeli airstrikes on Iranian oil facilities made a dangerous return to Earth in the form of "black rain," prompting international health officials to warn of serious risks to the public.

Clouds of toxic smoke unleashed into the atmosphere by U. S. -Israeli airstrikes on Iranian oil facilities made a dangerous return to Earth in the form of "black rain," prompting international health officials to warn of serious risks to the public.