CSE in its independent study, surveyed seven districts of Delhi-NCR to assess the sources of industrial air pollution and identify the hotspots. The study revealed that diesel generators have a significant contribution to the air pollution in the studied regions. Of the seven districts surveyed, Faridabad had the highest number of DG sets used in Industrial areas. Additionally, a 2018 WHO report also ranks Faridabad as the second most polluted city in the world. This report assesses the feasibility of converting existing diesel generators to natural gas generators, with technical, economic and environmental aspects taken into account. The analysis shows that a shift to natural gas generators will result not only in significant reduction in air pollution but will also prove to be cost-effective for users.