Gotta keep tryin.
There must be other motivating factors which kept people in there cars. A few possibilities come to mind:
I haven't been to Milan before. I do recall visiting Trieste many years ago. The sheer number of people on small scooters/motor bikes was astounding. I find it hard to believe their emissions were well-regulated. If Milan is flooded with such vehicles, perhaps much of the smog isn't caused by cars. (OTOH, roughly 40% of new car sales in Europe are diesels, so perhaps the VW debacle and similar problems by other manufacturers is key to their smog problem.)
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