I thought an old car test I read was a bit of an eye opener. It was about a couple of some family's old cars tested on the road and not in a lab. It was a two decade old 1.8 petrol golf and a one decade old similar sized diesel octavia. Both cars in good working order and completely roadworthy.
The old golf produced more than four times the nox of the octavia and obviously as is normal lots more co2. The real surprise was that the old octavia churned out only a small fraction of what the latest euro diesels really produce on the road. But because of their "wonder" lab results they will be allowed into some city centres while the less polluting octavia wont.
No results was shown for particulates but as the testing lab pointed out a good percentage of particulate dust comes from the road, tyres, and brakes which doesn't change with electric cars.
