The big deal on diesels is that they, in theory, burn all of the fuel that is injected, so there are no unhealthy hydrocarbons shooting out of the exhaust pipe. They’re also low on CO output. But the fuel type and high compression does produce small carbon traces particulates which are believed to be harmful. Land Rover engines have so far met legislation without using a particular filter, though it available as an option on Freelander 2.
Inherent excess oxygen in a diesel tends to produce harmful nitrogen oxide (NOx.)This is controlled party by the EGR which recirculates some of the inter exhaust gas back into the engine, giving a cooler burn and less NOx.
Petrol hybrid engines are more frugal and cleaner than current under development are likely to take the lead in the future. Exhaust Gas Recirculation system on 200 TDI feeds a proportion of exhaust gas back into engine air intake manifold.
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