P50 - Effect of Matrix Gas Variations on NO2 Measurements by a PEMS Device for Real Driving Emissions Tests
- Event
- SMSI 2025
2025-05-06 - 2025-05-08
Nürnberg - Band
- Poster
- Chapter
- Poster Session
- Author(s)
- M. Kim, H. Bohlius, V. Ebert, J. Nwaboh - Physikalisch-Technische Bundesanstalt, Braunschweig (Germany)
- Pages
- 332 - 333
- DOI
- 10.5162/SMSI2025/P50
- ISBN
- 978-3-910600-06-5
- Price
- free
Abstract
For legally required Real Driving Emissions measurements, the quantification of NO2 amount fractions is performed using Portable Emission Measurement System (PEMS). Although a PEMS must be accu-rately calibrated, the typical NO2 calibration gas matrix composition (e.g. synthetic air) differs signifi-cantly to that of car exhaust gas. This study shows that a change in matrix composition can cause considerable deviations in PEMS NO2 results. We found a slope difference of up to about 30 % between measurements performed in synthetic air and a matrix gas mimicking real exhaust gas composition.