Sayad, BouthainaAlkama, DjamelRebhi, RedhaMenni, YounesAhmad, HijazInc, MustafaSharifpur, MohsenLorenzini, GiulioAzab, EhabElnaggar, Ashraf Y.2022-10-262022-10-262021-10Sayad, B., Alkama, D., Rebhi, R. et al. 2021, 'Outdoor thermal comfort optimization through vegetation parameterization : species and tree layout', Sustainability, vol. 13, no. 21, art. 11791, pp. 1-15, doi : 10.3390/su132111791.2071-1050 (online)10.3390/su132111791https://repository.up.ac.za/handle/2263/87976The optimization of outdoor thermal comfort has become the keystone to guarantee the healthy and comfortable use of outdoor spaces. This study aims to optimize the outdoor thermal comfort through vegetation parameterization in a boulevard located in Guelma city, Algeria during summertime. However, two main parameters were investigated, species and tree layout, through a numerical simulation. We first collected microclimate data of a sunny summer day. Second, we used real microclimate data in different simulations using the Envi-met atmospheric model. The findings reveal that Ficus Nitida is the most significant species to intercept solar radiation and provide shade over the day in Souidani Boudjemaa Boulevard, with a maximum reduction of Ta = 0.3 °C and UTCI = 2.6 °C at 13:00 p.m. Tree layout is a determining parameter in the creation of shaded paths, based on the quality of the shadows cast by the trees, namely, their size. Thereby, planting the washingtonia palm trees along the center of the boulevard is the best option to maximize the shaded area within the boulevard, with maximum reduction of Ta = 1.8 °C and UTCI = 3.5 °C at 16:00 p.m.en© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.Outdoor thermal comfortVegetation parameterizationTree speciesTree layoutSummertimeOptimizationNumerical simulationEngineering, built environment and information technology articles SDG-03SDG-03: Good health and well-beingEngineering, built environment and information technology articles SDG-04SDG-04: Quality educationEngineering, built environment and information technology articles SDG-09SDG-09: Industry, innovation and infrastructureEngineering, built environment and information technology articles SDG-11SDG-11: Sustainable cities and communitiesEngineering, built environment and information technology articles SDG-13SDG-13: Climate actionEngineering, built environment and information technology articles SDG-15SDG-15: Life on landArticle