Aas, Wenche 
ORCID: https://orcid.org/0000-0002-2908-1970; Salameh, Thérèse ORCID: https://orcid.org/0000-0002-1490-169X; Wegener, Robert ORCID: https://orcid.org/0000-0003-2042-9333; Hellén, Heidi ORCID: https://orcid.org/0000-0001-7022-3857; Jaffrezo, Jean-Luc; Roldin, Pontus; Alonso-Blanco, Elisabeth; Alastuey, Andres ORCID: https://orcid.org/0000-0002-5453-5495; Amelynck, Crist; Arduini, Jgor ORCID: https://orcid.org/0000-0002-5199-3853; Bergmans, Benjamin ORCID: https://orcid.org/0000-0002-4324-449X; Bertrand, Marie; Borbon, Agnes; Bourtsoukidis, Efstratios ORCID: https://orcid.org/0000-0001-5578-9414; Bouvier, Laetitia; Butterfield, David; Buxbaum, Iris; Ceburnis, Darius; Claude, Anja; Colette, Augustin ORCID: https://orcid.org/0000-0002-0162-0098; Colomb, Aurélie; Darfeuil, Sophie ORCID: https://orcid.org/0000-0003-3307-2548; Dernie, James; Desservettaz, Maximilien ORCID: https://orcid.org/0000-0002-9550-6674; Díaz-Ramiro, Elías ORCID: https://orcid.org/0000-0003-1812-280X; Dufresne, Marvin ORCID: https://orcid.org/0000-0002-5451-5101; Dubus, René; Duval, Mario; Dury, Marie; Font, Anna; Fossum, Kirsten N. ORCID: https://orcid.org/0000-0002-4976-7259; Freney, Evelyn ORCID: https://orcid.org/0000-0002-9363-9115; Gangoiti, Gotzon; Ge, Yao ORCID: https://orcid.org/0009-0005-9113-8834; Gomez, Maria Carmen ORCID: https://orcid.org/0000-0003-0585-9386; Gómez-Moreno, Francisco J. ORCID: https://orcid.org/0000-0002-3981-8374; Gohy, Marie; Gros, Valérie; Hamer, Paul ORCID: https://orcid.org/0000-0003-0645-2932; Hellack, Bryan; Herrmann, Hartmut ORCID: https://orcid.org/0000-0001-7044-2101; Holla, Robert ORCID: https://orcid.org/0000-0002-6445-9510; Holubová, Adéla; Jensen, Niels R.; Jokinen, Tuija ORCID: https://orcid.org/0000-0002-1280-1396; Jones, Matthew ORCID: https://orcid.org/0000-0002-2006-8809; Käfer, Uwe; Kesper, Lukas; Klemp, Dieter; Kubistin, Dagmar ORCID: https://orcid.org/0000-0002-5467-9309; Marinoni, Angela ORCID: https://orcid.org/0000-0002-6580-7126; Mazzini, Martina ORCID: https://orcid.org/0009-0000-0706-0514; Thuy Dinh, Vy Ngoc; Ovadnevaite, Jurgita; Petäjä, Tuukka ORCID: https://orcid.org/0000-0002-1881-9044; Portillo-Estrada, Miguel; Přívozníková, Jitka; Putaud, Jean-Philippe; Reimann, Stefan ORCID: https://orcid.org/0000-0002-9885-7138; Renzi, Laura ORCID: https://orcid.org/0009-0006-6066-0942; Riffault, Veronique ORCID: https://orcid.org/0000-0001-5572-0871; Ritchie, Stuart; Robins, Chris; Rodríguez de Torres, Begoña Artíñano; Poulain, Laurent ORCID: https://orcid.org/0000-0002-9128-7881; Rüdiger, Julian; Sanocka, Agnieszka; Saez de Camara Oleaga, Estibaliz; Schoon, Niels; Seco, Roger ORCID: https://orcid.org/0000-0002-2078-9956; Simmons, Ivan; Simon, Leïla ORCID: https://orcid.org/0000-0002-4650-9457; Simpson, David ORCID: https://orcid.org/0000-0001-9538-3208; Solberg, Sverre; Tison, Emmanuel; Thomasson, August ORCID: https://orcid.org/0009-0005-8107-3950; Tsyro, Svetlana ORCID: https://orcid.org/0000-0002-7841-1446; Twigg, Marsailidh ORCID: https://orcid.org/0000-0002-5462-3348; Tykkä, Toni; Verreyken, Bert ORCID: https://orcid.org/0000-0002-5297-8524; Watne, Ågot; Williams, Katie; Yáñez-Serrano, Ana Maria; Yeung, Karen ORCID: https://orcid.org/0009-0006-0400-3980; Ylivinkka, Ilona ORCID: https://orcid.org/0000-0002-5591-4876; Yttri, Karl Espen ORCID: https://orcid.org/0000-0001-9904-5716.
2026
Measurement report: Spatial variability of VOCs, ozone, and carbonaceous aerosols during the 2022 European summer heatwave.
Atmospheric Chemistry and Physics, 26 (12).
8717-8751.
10.5194/acp-26-8717-2026
This study presents results from an Intensive Measurement Period (IMP2022) conducted during the European heatwave of July 2022, focusing on ozone, volatile organic compounds (VOCs), and carbonaceous aerosols at 31 sites across Europe. The episode featured persistent high-pressure systems, record-breaking temperatures, widespread ozone exceedances and concurrent atmospheric new particle formation and growth events. Coordinated measurements and chemistry transport modelling were used to examine the spatial variability of ozone, VOC composition, and secondary organic aerosol (SOA) formation under extreme meteorological conditions. Oxygenated VOCs (O-VOCs) constituted the largest fraction of total measured VOC mixing ratios, followed by non-methane hydrocarbons (NMHCs) and aromatics, with contributions from both anthropogenic and biogenic sources. Sensitivity simulations indicate that ozone formation was predominantly NOx-limited across most regions during IMP2022. However, the highest ozone peaks occurred under conditions of elevated NOx in combination with enhanced BVOC emissions. In contrast, SOA formation was slightly enhanced under low-NOx conditions and reduced in elevated NOx. Isoprene, aliphatic NMHCs, and O-VOCs dominated the ozone formation potential, while aromatics and monoterpenes were major contributors to SOA potential. Model simulations indicated that higher NOx concentrations can reduce SOA formation by about 10 %. The campaign also highlighted observational gaps underscoring the need for broader and higher-resolution VOC monitoring across Europe. Overall, further reductions in NOx emissions, alongside targeted control of key anthropogenic VOCs, would benefit air quality under future climate extremes.
Available under License Creative Commons Attribution 4.0.
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