AWEL, a governmental agency of the Canton of Zürich, Switzerland, has been using Opus Remote Sensing Devices for 18 years, to study the real-world emissions from motor vehicles in Zurich.
Their constant work represents the best continuous evaluation of road traffic emissions in Europe.
AWEL began using RSD systems with close support from Opus, but soon had complete autonomy to use them independently. In this way, AWEL rents the equipment when needed with greater flexibility.
This collaborative format is used by other European partners.
The methodology employed by AWEL is unique. Every year they place the Opus RSD in the same place, for a period of about 4 to 6 months. Only 2 locations have been used. As the emissions from motor vehicles driving in one location are different from those in another, this methodology allows the geographic variability to be eliminated. This way of assessing emissions over time allows for the identification of market trends, checking whether the emissions from vehicles are reducing year by year as they should.
The results are periodically published every year. The last report, issued on december 2019, is accesible in the following link:
The results of all the measurements since the year 2002 show that the decrease in real NOx emissions from gasoline-powered vehicles corresponds to the general trend in the tightening of emission standards. By contrast, the following findings were obtained for diesel-powered passenger cars and vans: