Research
Building a global database of real-world emissions to improve local air quality and mitigate climate change.
The TRUE Initiative collaborates with local governments, on-the-ground partners, and research institutions to gather and analyze real-world emissions data. These valuable insights help cities around the world as they seek to craft low-emission transportation policies and improve existing programs. These actions will provide effective actions to address the health and climate impacts from on-road vehicles.
Our methods for collecting and analyzing data drives action towards cleaner urban transport.
Explore our research
Factsheet
Europe
10 years after Dieselgate: Where are we now?
The Dieselgate scandal, which broke in September 2015, exposed the unlawful activities of the Volkswagen group in “cheating” laboratory emissions…
September 26, 2025
Report
Europe
Brussels
Life-cycle greenhouse gas impact of the low-emission zone in Brussels
Analyzes cumulative GHG reductions of the Brussels LEZ to model potential impacts and benefits….
March 13, 2025
Report
Europe
Bratislava
Emission measurements with ‘Plume chasing’ and subsequent inspection of heavy-duty vehicle (HDV) high emitters
Novel plume chasing technique piloted in Slovakia….
November 16, 2024
Technical Note
Europe
Gliwice
Potential impacts of a low-emission zone on air pollutant emissions in Gliwice
Analyzes the potential emission reduction benefits of a low-emission zone in Gliwice, Poland….
September 24, 2024
Report
Europe
Aberdeen
Real-world vehicle emissions in four major Scottish cities
Concludes a three year long real-world emissions testing campaign in four Scottish cities under the TRUE Initiative….
August 28, 2024
Report
Europe
Aberdeen
Assessment of real-world vehicle emissions from four Scottish cities in 2022
Remote sensing campaigns in Scotland collect real-world emissions data to help inform policy and identify defective or manipulated vehicles….
March 20, 2024