🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiSvenskaTiếng ViệtTürkçeРусскийالعربيةفارسیไทย한국어中文日本語EntityQ285028· pop 32· linked from 230 articlesExhaust gas recirculationNOx reduction technique used in gasoline and diesel enginesConnectionsspark-ignition engineEntityoxygenEntityCategoriesAir pollution control systemsChemical process engineeringEngine technologyNOx control