The miscellaneous publication No. 30 Part-XVI pertains to the state of Delhi and comprises besides geology and mineral resources, its enviromental hazards scenerio. This volume is the third updated and revised edition of its origina published in the year 2006. The volume includes updated map based on GSI Unified legend, 2017 on 1:50K GSM database with information on geology, geomorphology, environmental hazards and geohydrology of Delhi.