Citywide mobile air quality monitoring using GPS-enabled low-cost IoT sensors Shreyash Gujar, Hitesh Pamireddy, Naga Saiteja Maradani, Spanddhana Sara, Sachin Chaudhari and K. S. Rajan E3S Web Conf., 620 (2025) 01002 Published online: 12 March 2025 DOI: 10.1051/e3sconf/202562001002