Abstract
Air pollution in Indian megacities has been exceeding national and international standards. Indian megacity ‘Bengaluru’ is one amongst them where the identification of sources of air pollutants that contribute to the deterioration of air quality in cities and their spatio-temporal variability has become paramount importance. In this paper, we have made an attempt to develop a high resolution (∼0.4 km × ∼0.4 km) emission inventory of eight major pollutants for South-Asian megacity Bengaluru for 2020. The study quantifies the emission load from all possible sources in the city using megacity scenarios and bottom-up approach. The estimated annual emission for PM2.5, PM10, CO, NOx, SO2, VOC, BC and OC over Bengaluru are found to be 62.2 Gg/yr, 113.9 Gg/yr, 447.5 Gg/yr, 294.5 Gg/yr, 194.9 Gg/yr, 393.8 Gg/yr, 22.9 Gg/yr, and 36.5 Gg/yr respectively. The transport sector remains the dominating source of all pollutants. The unattended anthropogenic sources like windblown road dust, municipality solid waste burning are emerging sectors in the identified emission hotspots. Both traditionally dominating sectors like transport and industries play an acute role in the deteriorating air quality across the megacity. This developed new surface emission dataset will be a critical tool for air quality study and to frame pollution control strategies.
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