In early 2013, the U.S. Environmental Protection Agency (EPA) published national standards governing the emission of hazardous air pollutants (HAP) from industrial, commercial, and institutional boilers. Separate rules were issued for boilers located at major sources (facilities with the potential to emit 10 or more tons of any single HAP and/or 25 or more tons of total HAP per year) and area sources (facilities with the potential to emit less than 10 tons of any single HAP and/or less than ...

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