Distribution of cars in the Italian city of Cagliari 2017, by emission standard
In 2018, Euro 4 cars made up about a third of the number of cars in the Italian city of Cagliari. The Euro 5 and Euro 6 classes accounted for 17 and 12 percent of the number of cars in the city, respectively. One in ten cars belonged to the unregulated Euro 0 category, which was the most polluting class of vehicles.