The graphic explains the chemical processes involved in the conversion of nitrogen oxides into water and nitrogen by adding AddBlue to diesel engines:

 

 {
 "excerpt": "Industry wants to curb nitrogen oxide emissions from diesel engines using modern catalytic converter technology. One possibility is the admixture of AdBlue, which contains urea. But how exactly does it work?",
 "creationDate": "2018-11-30",
 "permalink": "https://ednh.news/exhaust-gas-purification-for-diesel-vehicles/",
 "language": "en",
 "categories": "Climate change|Environmental pollution",
 "media": "Webgraphic",
 "imageFeatured": "https://ednh.news/wp-content/uploads/2018/11/181130-99-34884.jpg",
 "status": "publish",
 "authorId": "8",
 "author": "dpa"
}