Concawe NO2 Viewer

The revised EU Ambient Air Quality Directive sets more stringent limits for nitrogen dioxide (NO₂), with a long-term ambition to move closer to WHO air quality guideline values. As a result, NO₂ pollution from traffic and other sectors will continue to pose challenges across the EU, and additional measures will likely be required to achieve full compliance.

Understanding the origins of NO₂ pollution is essential for designing effective and targeted air quality policies. Source apportionment plays a central role by identifying the contribution of long-range transport and local emission sources. However, source apportionment often involves complex and computationally intensive model chains to assess long-distance and local effects, only accessible to expert users.

To address this barrier, Concawe, in collaboration with VITO, has developed an innovative, multi-year project resulting in the Concawe NO₂ Source Apportionment Viewer: a visual, user-friendly web application that provides both experts and non-experts with detailed insights into the contribution of different sectors to current and future NO₂ pollution across the EU27+UK. The Viewer also enables the assessment of potential traffic measures at city scale.