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First paper only covers CO2. Second paper only considers fine-size (<20 nm) particulates (and not larger sizes like 100nm+) of direct injection cars, and is a
by jeffwass 8y ago
First paper only covers CO2.
Second paper only considers fine-size (<20 nm) particulates (and not larger sizes like 100nm+) of direct injection cars, and is a bit misleading by comparing six cars to a single carefully-selected diesel car with particulate filter. Further, in reality here in a London, people are cutting open their Diesel particulate filters to avoid cost of replacing clogged filters and still passing MOT exhaust tests, which apparently don’t/can’t check for filter tampering.
Third paper is way back in 2002 and considers only cars, not heavy trucks and buses, which are way worse in urban settings.
- gamblor956 8y agoAs jeffwass notes, diesel is better at CO2 emissions. But in California, particulate emissions matter more, especially in SoCal, which is prone to inversions that trap particulate pollution.
- djaychela 8y agoI don't disagree with your points here, other than the MOT changed in May to include inspection of the DPF system if fitted (on 2006 onwards vehicles) , including checking for one which has been cut open. Obviously not foolproof, but at least its a start - if the DPF is missing, it's a fail now.