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Sulphur dioxide (SO2), a significant contributor to air pollution, may be within the national ambient air quality standard in all major cities in India, but the country is the largest cumulative emitter of this pollutant in the world and thus prone to being a victim of a cocktail of several toxic air pollutants. As a reactive pollutant, SO2 reacts with other air pollutants to form sulphate particles and makes a significant part of particulate matter (PM2.5), which has the largest public health impact. It is estimated that SO2 commonly makes up more than 10% of the deadly fine particles in India and China. Though Russia’s Norilsk smelter complex is the largest individual SO2 emission hotspot, India figured at the top, contributing more than 15% of all anthropogenic sulphur dioxide globally in 2018. The primary reason for the country’s high emission output is the expansion of coal-based electricity generation over the past decade.