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  Deep Sea Ocean going cargo vessels are already subject to Sulphur Emission Control up the English Channel and into the North Sea. We have to burn Fuel Oil with very low Sulphur content as soon as we enter the SECA at the Western end of the Channel. The same Sulphur restriction is coming into force for Marine Diesel Oil. However, when burning Low Sulphur Fuel Oil, the engine is less efficient and vessels burn more of the more expensive product which leads to higher CO2 emissions - oo er.
  
  The layer of brown that we see out across the Channel at the moment is with us everytime we have an extended period with High Pressure over the UK in summer months - simply put - the hot air rising from the land and the earth's surface meets the downward pressure of the High and emissions are trapped and condense in a layer where the velocity of the rising air column is cancelled out by the downward velocity of the air column causing the High pressure and we get (and have had on and off for many years) a mucky brown layer of condensed emissions from ships transiting the Straits.
  
  I often got a similar effect during the summer months in Hong Kong when the mucky brown layer formed at the height of my flat windows on the 35th floor in Tsai Wah on Hong Kong island.

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