Nepal, March 11 -- Reports are emerging of black rain falling over parts of Iran in the hours after US-Israeli airstrikes on oil depots on the weekend, with some outlets describing it as "acid rain".

Iranian residents have reported headaches, difficulty breathing, and oil-contaminated rain settling on buildings and cars. Iran's Red Crescent Society warned rainfall following the strikes could be "highly dangerous and acidic."

As an atmospheric chemist and chemical engineer who researches air pollution, these reports are very worrying, and indicate much more than just acid rain.

This rain would include acids but also likely a host of other pollutants that are harmful to humans and the environment in the short and long term. It may even b...