This year, the APCG group was represented at the International Technical Meeting On Air Pollution Modeling And Its Application, Copenhagen, 14-18 October. Martin Ramacher (Hereon, Germany) presented the work he did visiting NOA, with indoor-outdoor residential measurements in the frame of ATMO-ACCESS project (PIRAthe). Our modelling results and these measurements supported his new calculations for the dynamic exposure of Athens population to the air pollution levels. Eleni Athanasopoulou showed the modeling results from Eiffel project, supporting the estimation of AQ co-benefits from climate change mitigation scenarios for the building and the road transport sectors. The regional authorites, who were leading this pilot case, have now the relevant decision support application (http://urban-sustainability.apcg.meteo.noa.gr/) to reach the National goals supporting the Paris Agreement. Last, Matthias Karl (Hereon, Germany) presented the application of the latest advancements of Stelios Myriokefalitakis in the city-scale model EPISODE-CityChem, which supported the simulations of inorganic aerosol chemistry bound to sea-salt aerosol production and their comparison for Athens and Hamburg.