Main Emission Sources

The main sources of emissions contributing to acid rain are:

For sulphur dioxide (SO₂):

• Base metal smelters
• Fossil-fuelled power plants
• Industrial fossil-fuel combustion sources (natural gas plants, pulp and paper mills, petroleum refineries, cement plants, upstream oil and gas, etc.)

For nitrogen oxides (NOx):

• The transportation sector (automobiles, trucks, off-road engines)
• Fossil-fuelled power plants
• Industrial fossil-fuel combustion sources (natural gas plants, pulp and paper mills, petroleum refineries, cement plants, upstream oil and gas, etc.)