The LENS partner Czech University of Life Sciences Prague cooperated with other Czech scholars to publish a paper on remote sensing measurements of the point sampling type. Even though measurements in the Czech capital of Prague were planned as part of the previous CARES project, tests of vehicles at the main vehicular entrance gate of the university were carried out regardless. The results of the assessed air quality samples, which were collected by a line attached to the road surface in the center of the travel lane, have been summarised in this paper.
The study explores a low-cost method for detecting malfunctioning or absent diesel particulate filters (DPFs) using remote sensing at a campus entrance gate. Sampling vehicle exhaust with non-volatile particle number (nvPN) counters and gas analyzers, it provides an efficient alternative to traditional emissions inspections, supporting air quality monitoring and regulatory compliance.
Experimental Setup
At the Czech University of Life Sciences, a sampling line captured exhaust from vehicles entering the campus. Instruments measured nvPN concentrations, particle size distributions, and gaseous pollutants like CO, CO₂, and NOx. Data from 48 vehicles were compared with a periodic technical inspection-style idle test to validate the methodology.
Key Findings
Results showed a strong agreement between roadside remote sensing and idle nvPN tests, effectively distinguishing high-emission vehicles. Vehicles with malfunctioning DPFs exhibited significantly higher particle counts. The system also demonstrated its adaptability for smaller vehicles like motorcycles and mopeds.
Broader Implications
This cost-effective and scalable method can be applied to high-traffic areas like airports, parking garages, and national parks. By leveraging controlled vehicle stop points, it ensures consistent data collection. Combining nvPN counters with low-cost CO sensors enhances detection, especially for vehicles with faulty emissions systems.
Conclusion
The proposed setup offers a robust and practical solution for emissions compliance monitoring, identifying high-emission vehicles efficiently and contributing to improved air quality and regulatory enforcement.