Unravelling the Origin of High Ozone Concentrations in Southwestern Europe
This study aims to quantify the contributions to surface ozone (O3) concentration in the Iberian Peninsula (IP) from the main NOx emission sectors in the region along with the imported O3 during a 10-day episode. The work applies an Integrated Source Apportionment Method within the CALIOPE air quality system at 4-km resolution. This study finds that the imported O3 is overall the larger contribution to its surface concentration. Contributions from local/regional sources are decisive in the O3 peaks downwind of main nitrogen oxides (NOx) hotspots in the IP under stagnant conditions.
This study was supported by the Spanish Ministry of Economy and Competitiveness and FEDER funds under the project PAISA (CGL2016-75725-R) and the “Red Española de Supercomputación” (AECT-2017-1-0008). The views expressed in this article are those of the authors and do not necessarily represent the views or policies of the U.S. Environmental Protection Agency.