Distribution of motorcycles in the Italian city of Naples 2017, by emission standard

In 2017, the largest share of motorcycles circulating in the Italian city of Naples were classified as Euro 3: 37 percent of motorcycles belonged to this category. About one in four motorbikes in Naples belonged to the Euro 0 group, the most polluting category.

2017年，在意大利那不勒斯市流通的摩托车中，占比最大的为欧三排放标准：该类别占摩托车总数的37%。约四分之一的摩托车归属于污染最为严重的欧零排放组。