Coal burning power plants do not need to be nearby.  This pollution travels for hundreds of km.  Hydrogen sulfide from the stacks converted into sulfuric acid and delivered in rainfall.  An atmospheric monitoring aircraft detected the signature of the stacks of the Four Corners Powerplant (New Mexico, USA) at 40,000 ft over Panama.

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Coal burning power plants do not need to be nearby.  This pollution travels for hundreds of km.  Hydrogen sulfide from the stacks converted into sulfuric acid and delivered in rainfall.  An atmospheric monitoring aircraft detected the signature of the stacks of the Four Corners Powerplant (New Mexico, USA) at 40,000 ft over Panama.