"....due to falling below the 100g/km emmisions target."
That is not (now) the point. The pollution issue has moved way beyond CO2. Beyond, even, particulates.
Diesels managed (just) to keep up with the lower emissions of petrol engines in respect of CO2, then particulates, but at the cost of complex exhaust systems.
Now they could be screwed, because NOx is seen as the problem, and diesels produce a relatively large amount of it.
This is controlled by EGR techniques in both petrol and diesel engines, but this has proved inadequate in the latter. Ironically, EGR tends to result in increased particulate production in diesels.
Diesel exhaust, as it stands, has been identified as "probably carcinogenic".
Things have moved a long way since I drove my beloved diesel Peugeot 306 HDi, which had a catalytic converter in the exhaust system and nothing else. What a lovely engine - economical, cheap to maintain and fun to drive! The first diesel car I had and the last.
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