Catalysing local action for clean air: a guidebook to map hyperlocal sources of air pollution

This study proposes a complementing approach to existing scientific studies in generating hyperlocal information on the causes of pollution in a city. The methodology has been developed and refined in close consultation and coordination with DoE (Department of Environment, (GNCTD)), Delhi. With a dedicated field team and geographic information system (GIS) tools, the study analyses data from a system created to catalogue 17 distinct dispersed pollution sources at the hyperlocal level. Updating pollution source information in cities is challenging due to resource constraints, expertise, and time for source apportionment and emission inventory studies. As of December 2022, only 30 per cent of the 131 non-attainment cities had completed a source apportionment/ emission inventory study. The study has also developed a custom indicator, Composite Ward Score (CWS), that supports municipalities in identifying and managing pollution hotspots for effective mitigation efforts and overcoming resource constraints faced by Urban Local Bodies (ULBs).