Mesoscale numerical weather prediction models usually provide information regarding environmental parameters near urban areas at a spatial resolution of the order of thousands or hundreds of meters, at best. If detailed information is required at the building scale, an urban-scale model is necessary. Proper definition of the boundary conditions for the urban-scale simulation is very demanding in terms of its compatibility with environmental conditions and numerical modeling. Here, steady-state computational fluid dynamics (CFD) microscale simulations of the wind and thermal environment are performed over an urban area of Kozani, Greece, using both the k-ε and k-ω SST turbulence models. For the boundary conditions, instead of interpolating vertical profiles from the mesoscale solution, which is obtained with the atmospheric pollution model (TAPM), a novel approach is proposed, relying on previously developed analytic expressions, based on the Monin Obuhkov similarity theory, and one-way coupling with minimal information from mesoscale indices (V_y = 10 m, T_y = 100 m, L_*). The extra computational cost is negligible compared to direct interpolation from mesoscale data, and the methodology provides design phase flexibility, allowing for the representation of discrete urban-scale atmospheric conditions, as defined by the mesoscale indices. The results compared favorably with the common interpolation practice and with the following measurements obtained for the current study: SODAR for vertical profiles of wind speed and a meteorological temperature profiler for temperature. The significance of including the effects of diverse atmospheric conditions is manifested in the microscale simulations, through significant variations (~30%) in the critical building-related design parameters, such as the surface pressure distributions and local wind patterns.

During the last 50 years, the vast majority of European countries have relied on coal and imported carbon-containing fuels to meet their growing electricity demand. Coal is the only fossil fuel in significant reserves across Europe. However, the pressing threat of radical climate change and the looming depletion of fossil fuels necessitate a structural transformation from a conventional centralized fossil fuel-based electricity generation system to an innovative decentralized system based on zero carbon (green) energy resources. In this context, one important issue for communities operating coal-based Thermal Power Stations (TPS) nearing retirement is whether the European Union (EU) policy can ensure a socially just development of the coal mining areas during the coal phase-out. The objective is to avoid a decline in living standards and mass immigration. In response to the EU’s decarbonization policy, the Greek state has recently decided to retire the lignite-based West Macedonia TPS, which has been in operation since the 1970s. Since its establishment in August 1950, the (initially State-controlled) Greek Public Power Corporation (PPC) has undertaken the responsibility to operate the quarries and the six local TPS, offering approximately 25,000 direct and indirect jobs. Over the last 50 years, the extraction of lignite and the operation of the 4500 MW_e TPS of West Macedonia has been the primary economic activity, accounting for nearly 45% of the entire Region’s GDP. While both the Greek state and the EU have prepared and presented plans to financially support local communities and encourage new private and public investments, local citizens remain anxious about their future. The present study investigates the attitude of young scientists towards the forthcoming radical changes linked to the green transition in seriously affected EU Regions, with a focus on West Macedonia. The proposed analysis in West Macedonia reveals the skepticism of young people regarding the speed of the green transition and concerns about significant migration and potential brain drain. On the other hand, the implementation of EU initiatives, including the involvement of young scientists in the planned new green energy-related activities, offers a promising alternative solution. This engagement can lead to the successful integration of local communities into the sustainable and green future envisioned by the EU.

The government decision to promote the change of energy mix has led to a serious decrease in industrial activities in the energy basin of Western Macedonia and subsequently had a positive influence on the air quality of the region. To examine the fact and estimate the current atmospheric emission sources, PM10 samples were collected at different sites in Western Macedonia, Greece, from February 2022 to May 2023 and were analyzed for metallic components, major ions, and PAHs. The dataset was then analyzed using PMF and CMB model to identify the possible emission sources. In this study, the first results are presented and discussed.