In 2017, Mayor Anne Hidalgo of Paris and Mayor Saddiq Khan of London jointly committed to making data on real-world vehicle pollutant emissions available to residents of those cities.

Remote sensing is one technique used to measure real-world NOx emissions in Europe. Remote sensing measurements conducted by the Canton of Zurich are unique in terms of how consistently they have been collected since 2000 and the steep road grade at the main remote sensing monitoring site.

While the Dieselgate scandal raised awareness of defeat devices—software calibrations that manipulate pollutant emission controls when vehicles are in the real world—third-party evaluation remains difficult because these devices are embedded in sophisticated computer code.

Remote sensing is potentially the best option for fleet emissions monitoring, the development of an emissions factor, the identification of individual high- or low-emitting vehicles, and the screening for groups of high-emitting vehicles for market surveillance.

Remote sensing of emissions has a number of important characteristics that make it particularly useful for real-world emissions surveillance.

This position brief makes specific recommendations regarding the adoption of Real Driving Emissions (RDE) testing in India.