Explaining vehicle emissions – why do laboratory and road measurements differ? — European Environment Agency

Explaining vehicle emissions – why do laboratory and road measurements differ? — European Environment Agency
The road transport sector is a major contributor to Europe’s emissions of greenhouse gases and air pollution. For certain pollutants, vehicles can emit substantially higher emissions on the road than official emissions tested in laboratories. A report released today by the European Environment Agency (EEA) provides a non-technical guide that describes the reasons for these often significant discrepancies.