Air Quality and Hazardous Gas Detection using IoT for Household and Industrial Areas G. Karuna, R.P. Ram Kumar, Steven Gopaldas, Vasista Parvathaneni and Teddu Lokesh E3S Web Conf., 391 (2023) 01146 Published online: 05 June 2023 DOI: 10.1051/e3sconf/202339101146