Assessment and risk prevention of air pollution in urban sites Mariana Panaitescu, Fanel-Viorel Panaitescu, Cornel Panait, Octavia Bardasu and Viorica-Ani Merla E3S Web Conf., 180 (2020) 04014 Published online: 24 July 2020 DOI: 10.1051/e3sconf/202018004014