In accordance with German road traffic licensing regulations (StVZO), five different particulate reduction levels have been laid down according to which particulate reduction systems (diesel particulate filters) must be categorised. Which PM (particulate matter) level a vehicle accords to depends on the exhaust emissions standard a vehicle without a filter fulfils and on the filter system retrofitted. Levels PM1 to PM3 apply to vehicles to which a filter has been retrofitted. Level PM1 applies to Euro 1 and Euro 2 diesel-engined cars. Following retrofitting of a filter, the vehicle must comply with the Euro 3 particulate limit of 50 mg/km. Level PM2 applies to Euro 3 diesel-engined cars. Following retrofitting of a filter, the vehicle must comply with the particulate limit of 25 mg/km applicable to Euro 4 diesel cars. In the case of level PM3, Euro 4 cars must comply with a particulate limit of max. 12.5 mg/km following retrofitting of a filter.
Last update on 2013-07-05 by Stefen Baetge.