Characterization of Trace Gases and Green House Gas in Megacity New Delhi Arti Choudhary, Pradeep Kumar, Anuradha Shukla, Siddhartha Singh and Abhay Kumar Singh EPJ Web Conf., 237 (2020) 03008 Published online: 07 July 2020 DOI: 10.1051/epjconf/202023703008