IoT based solar powered air purifier with air quality monitoring system Aparna Jose, C. Abraham, Akhil K Soman, Ajumal T J, Anandakrishna and Abison Shibu E3S Web of Conf., 529 (2024) 04016 Published online: 29 May 2024 DOI: 10.1051/e3sconf/202452904016