Factories need an energy source to power their production processes. In the United States, this has been electricity generated by fossil fuel burning, in particular coal. Air pollutants emitted by coal-fired power plants include nitrogen and sulfur oxides, hydrogen chloride and hydrogen fluoride gases, and arsenic, lead and other metals. Power generation for factories may cause greater air pollution than the factory processes. Natural gas is the least polluting fossil fuel for power generation. It emits nitrogen oxides and carbon dioxide on burning but in far lower quantities than coal
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