I doubt the claims being made - they are almost certainly selective in the conclusions and ignore some fundamental questions.
When burning fuel and air (with particulates) the component parts of the toxic mix do not somehow disappear. There are only a few options:
- the gases (oxygen, nitrogen, hydrogen) are broken down and releaased separately
- the toxic chemicals are re-engineered to produce non-toxic compounds
- the car stores the toxic components and later releases them in huge quantities (regeneration)
Diesels are clearly now less polluting than they were - but don't kid yourself that they are the answer to all the problems.
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