Using a new satellite-based method, NASA scientists have located 39 unreported and major human-made sources of toxic sulphur dioxide emissions. The unreported emission sources, found in the analysis of satellite data from 2005 to 2014, are clusters of coal-burning power plants, smelters, oil and gas operations found notably in the Middle East, but also in Mexico and parts of Russia.In addition, reported emissions from known sources in these regions were — in some cases — two to three times lower than satellite-based estimates.
