Typically, when people think of sources of air pollution, they think about buildings with big smoke stacks like power plants and factories. Yet these sources make up a relatively small proportion of air pollution emissions in Minnesota. Today, most of the air pollution in Minnesota comes from smaller, more widespread sources.
- Industrial facilities. Typically large, stationary sources with relatively high emissions, such as electric power plants and refineries.
- Neighborhood sources. Typically stationary sources, but generally smaller sources of emissions than permitted sources — dry cleaners, gasoline service stations and fires such as residential wood combustion, inadvertent or intentional agriculture burning, prescribed burning or forest wild fires.
- Vehicles and equipment. Onroad vehicles: cars and trucks. Off-road sources: off-road vehicles and portable equipment powered by internal combustion engines, lawn and garden equipment, construction equipment, aircraft, and locomotives.