Industrial activity, particularly coal-based thermal power plants, is generally considered the largest source of air pollution in India, accounting for roughly 51% of total emissions. Other major contributing sectors include vehicular emissions, agricultural crop residue burning, road dust, and residential biomass burning.

Industrial activity, particularly coal-based thermal power plants, is generally considered the largest source of air pollution in India, accounting for roughly 51% of total emissions. Other major contributing sectors include vehicular emissions, agricultural crop residue burning, road dust, and residential biomass burning. 
Key contributors to India's poor air quality include:
Industrial Emissions: -
Coal-fired power plants and manufacturing units are the primary sources.
Vehicular Pollution:-
 Vehicles account for 60-70% of overall pollution in some estimates.
Agricultural Crop Burning: -
A major source of seasonal,, acute, smog and pollution, especially in autumn and spring.
Residential Sector: -
Burning of biomass (wood, dung) for cooking/heating is significant.
Construction Dust & Waste Burning:- 
Contributes about 45% of PM pollution. 
While industrial pollution holds the largest share nationally, in metropolitan cities like Delhi, vehicular emissions and road dust are the primary drivers. 
Pollution in India:-
Industrial activity is a major contributor to pollution in India. According to some estimates, industrial pollution accounts for 51 percent of the country's air.
MJF Lion ER YK Sharma 

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