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WHO warns of health risks from 'black rain' in Iran  ReutersAir strikes cause black rain and 'unprecedented' pollution in Tehran, scientists say  BBCBlack Rain Health Risks Explained: WHO Warns Of Toxic Fallout In Iran  NDTVBombing of Iran’s oil infrastructure to have major environmental fallout, experts warn  The GuardianIran war poses a threat to Pakistan's air quality as pollution drifts across border  Telegraph India