Ah, Milan, home to great shoes, high fashion and more pm10s
—small pollution particles that can cause cancer and breathing problems—than any other city in Europe. In fact, according to a study
by Italian environmental group Legambiente, Milan has more smog than any other city in Europe and the continent's second-highest level of ozone. Most of the problem comes from the city's love of driving, but that's changing quickly: Congestion pricing in downtown Milan implemented in January has dropped traffic by 26 percent and, residents hope, will lead to drops in smog as well.