We are doing science for policy
The Joint Research Centre (JRC) is the European Commission's science and knowledge service which employs scientists to carry out research in order to provide independent scientific advice and support to EU policy.
Portable Emissions Measurement Systems, or PEMS, measure emissions from combustion engines as the vehicle or the equipment is being used, which allows real-world in-use testing.
PEMS offer a modern and innovative counterpart to check the impact of emissions from combustion engines upon the environment. The PEMS used for emissions regulatory purposes integrate advanced gas analyzers, exhaust mass flow meters, weather station, Global Positioning System (GPS) and connection to the vehicle networks. PEMS provide a complete and very accurate real-time monitoring of the pollutants emitted by the engines (HC, CO, CO2, NOx [or NO + NO2], PM) together with the associated engine, vehicle and ambient parameters.