What is the main reason behind acid rain in industrial cities?

1
NH3 released by Industrial plants and coal gas
2
NO2 and  SO2 released by the burning of fossil fuels
3
CO2 released by burning of fuels like wood and charcoal, cutting of forests and increased animal population
4
CO released in the atmosphere by incomplete combustion of coke, charcoal and other carbonaceous fuels in the paucity of oxygen

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