Yesterday, analyses of the air in several parts of France contained high levels of ultrafine particles emitted by road vehicles. Among the guiltiest culprits were older diesel vehicles with minimal emission-control systems, particularly those built under the Euro 4 standard in effect through 2005. Over the last year, Paris has instituted... How Paris will ban the dirtiest diesels: color-coded stickers
Yesterday, analyses of the air in several parts of France contained high levels of ultrafine particles emitted by road vehicles. Among the guiltiest culprits were older diesel vehicles with minimal emission-control systems, particularly those built under the Euro 4 standard in effect through 2005. Over the last year, Paris has instituted...