Nano-Engineered Biochar Coatings for Air Pollution Mitigation in Smart City EnvironmentsMegala Rajendran, Younus Shaeel Ajeel, Safa Sabri, Nada Qasim Mohammed, Hassan Khalid Abozibid and Reem Hamdan KHaddourE3S Web Conf., 711 (2026) 02008DOI: https://doi.org/10.1051/e3sconf/202671102008