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The only possible argument about the air quality is probably the current effect of the idling engines stuck either side of Blackwall tunnel
Silvertown tunnel will be exactly the same. Traffic will increase to fill the new capacity, as it always has done, and the average speed of London traffic will remain at around 10 miles an hour: slower than this and people naturally stop driving.
William.
The only possible argument about the air quality is probably the current effect of the idling engines stuck either side of Blackwall tunnel