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bjh said:
I don't think the older diesels were quite so bad for NOXs. Loads of smoke particles though and if you also smoked that probably accounts for the 'noxious state'.šŸ˜. Increasing efficiency started to push temperatures up a bit and that does increase NOX.
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I'm not so sure if that is true, but it's possible. Modern diesels do burn at a higher temperature, and diesels are lean burn, creating the NOx.

Lean burn petrols which have been tried in the past create as much NOx as diesels.
 
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