The real-time source apportionment study conducted by IIT Kanpur for the Delhi government has resumed after a brief halt due to pending payment. The study reveals that vehicles are the primary contributors to Delhi s PM2.5 pollution levels. Secondary inorganic aerosols, which can travel from distant sources, are the second highest contributors. Biomass burning ranks third. The study s data is available on the R-aasman portal. Analysts suggest that this real-time data can be used to regulate pollutant emissions and improve air pollution governance if there is political will to address the issue.