On October 10, the World Health Organization (WHO) issued a warning regarding the hazardous effects of "black rain" and airborne toxic compounds resulting from recent Israeli attacks on oil facilities in Iran. The organization supported the Iranian government's guidance for citizens to stay indoors due to the health implications of these environmental changes. Reports indicated that Tehran experienced heavy, oil-laden smoke and rain shortly after bombings targeted a local oil refinery on October 9.

WHO representative Christian Lindmeier expressed concern during a press conference in Geneva, emphasizing that both black rain and acid rain pose significant respiratory threats to the general population. He highlighted the extensive release of toxic hydrocarbons, sulfur oxides, and nitrogen compounds into the atmosphere due to the explosions. These compounds can not only result in immediate health issues but could also have longer-term effects on air quality and public health in the region.

The Iranian authorities are working in conjunction with the WHO's office in Iran to address the health crisis stemming from the attacks. The alarming environmental conditions raise awareness about the potential dangers associated with military conflicts and the unexpected consequences they can have on public health and safety, underscoring the need for international cooperation in monitoring and mitigating such health emergencies.