How Paris will ban the dirtiest diesels: color-coded stickers

Paris, by Flickr user Alexandre Dulaunoy (Used under CC License)

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… …read more