Rome

First Paris, then a pair of German cities, and now the Eternal City. Two weeks ago, the mayor of Rome announced on her Facebook page that the city would ban diesel cars altogether by 2024. It's not clear whether the ban applies solely to the older, most-polluting diesels as it does already in Paris, or to any vehicle with a diesel engine. CHECK OUT: German court rules cities may ban older diesel vehicles A court ruling issued February 26 in Germany had been widely awaited as a sign of how far cities could go in aggressively attacking unhealthy air within their municipal limits. The German...