Pollutant emissions measurement on running vehicles

The challenges of reducing pollutant emissions, greenhouse gases and the ecological impact of vehicles and machinery are now, more than ever, at the center of national and international concerns. The demand for expertise in the field of on-board vehicle pollutant measurements has grown steadily since Dieselgate (2015).

At CRMT, we have developed a strong expertise in this field since 2005, when we acquired our first PEMS. Today, we are specialized on pollutant emissions measurements on running heavy-duty vehicles (ISC cycles) and we work with the largest operators and vehicle manufacturers. Our technologies and working methods are nationally recognized by the main French energy institutions (ADEME, CRIGEN, UGE).

Our services meet the criteria for certification with dedicated organizations such as VCA and UTAC.

In a few figures, the Embedded Measurements division of CRMT is each year:

  • Several dozen heavy goods vehicles (trucks, buses, etc.) tested,
  • Several hundred standardized cycles carried out,
  • 97% success rate


We carry out pollutant measurement campaigns on various types of vehicles: heavy vehicles (trucks, buses, coaches), special road and non-road vehicles (EMNR cycles), agricultural machines, light vehicles (RDE cycles), trains and boats . A large part of our services are carried out on heavy goods vehicles for the purposes of certification or verification of production conformity to meet regulatory obligations (In-Service Conformity cycles).

Pollutant measurement campaigns consist of instrumenting a vehicle with the measurement equipment best suited to your needs, and carrying out defined routes to collect data (consumption, pollutant emissions) in real operating conditions for a few days and up to 'to several years depending on the need. These are collaborative projects between our technical teams and each client, to provide recommendations and solutions to problems based on the analysis of the data collected.


We use FTIR (Fourier Transform Infrared Spectroscopy) analyzers to measure the emissions of non-regulated pollutants in real operating conditions: VOCs, methanol, ethanol, acetaldehyde, MTBE, DME, acetone, SO2, acetic acid, etc.


We use two different measurement technologies for the measurement of regulated pollutants:

CEMS Technology (Continuous Emissions Measurement System)

CEMS technology makes it possible to carry out measurements over long periods (several years) in commercial operation of the vehicle (safe transport of passengers or goods).

Pollutants measured with CEMS: NOx, CO2, presence of NH3


CEMS was designed and developed in-house as part of Project Equilibre to meet operating needs not achievable by PEMS. More information

PEMS Technology (Portable Emissions Measurement System)

PEMS technology allows high precision measurements for R&D and certification of engines (RDE, ISC, EMNR) for a few days and in real traffic conditions.

Pollutants measured with PEMS: CO, HC, NOx, CO2, NO2, particles (PN)

CRMT uses exclusively Horiba brand measurement equipment (commercial partner). More information


Used separately, or together, CEMS technology can be complementary to the results provided by PEMS analyzers. Our experts will advise you on the best monitoring strategy to achieve  your study goals.

For any other type of engine performance measurement and / or specific developments contact us, we will be happy to develop your projects with you.

CRMT analysis and expertise

Data analysis allows operators, elected officials, private laboratories, engine manufacturers, transporters or even governments to have reliable and scientific results from vehicles in REAL operating conditions to make important decisions in terms of :

  • Consumption's reduction,
  • Pollutant emissions' reduction,
  • Review of its operating strategy,
  • Definition of a strategy for setting up new vehicles,
  • Identification of the fuel that presents the best economic / environmental compromise,
  • Technological benchmark.
Trust us with your project !

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