Satellites can see the pollution trails from individual ships

All hands have to be on deck if the world is going to tackle degradation, and one of the biggest emitters is also one of the least well known – international shipping.  A 2018 study estimated that pollution emitted from cargo ships resulted in 400,000 annual premature deaths from lung cancer and heart disease.  Many of those deaths resulted from the sulfur dioxide the ships were belching into the air.  Since the beginning of the year, sulfur dioxide has been capped at .5% of emissions, compared to 3.5% previously.  While the long term benefits of that emissions cap will take some time to appear, there’s another pollutant that could potentially be tackled in the near future: nitrogen dioxide.

Nitrogen dioxide (NO2) is one of the emissions from diesel engines, and has been strictly capped in the automotive market for a number of years.  While the shipping industry so far has escaped regulation, there is a strong possibility that restrictions may be coming in the near future.  Regulations in themselves are great, but they are useless if not enforced, and the open ocean is a notoriously difficult place to enforce them.  That difficult task might have just gotten easier, as scientists at the European Space Agency realized they can use satellite data they are already collecting to track the nitrogen dioxide emissions of individual ships on the open ocean.

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