In article ,
Another John wrote:
The pollutant in the news at the moment is NOx. And that isn't removed
by a particulate filter. That filter is meant to stop the visible
black smoke from a hard working diesel. And anyone who does any
driving at all will have seen plenty modern diesels smoking.

So ... the invisible nasties in diesel are even nastier than the
invisible nasties in petrol?

A modern petrol engine produces very little NOX.

--
*The first rule of holes: If you are in one, stop digging!

Dave Plowman London SW
To e-mail, change noise into sound.