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EN20 - NOx, SOx, and other significant air emissions

AEP System - By Ownership U.S. Tons
  SO2 Nox
2011 415,600 130,600

The vast majority of this data (99%+) is based on Continueous Emission Monitoring System (CEMS under Title IV) data accepted/verified by EPA. The totals reflect AEP's "energy take" share of emissions at jointly owned facilities.

The non-Title IV emissions are based on fuel consumption, recorded at the facility, and EPA AP-42 emission factors.

Title IV emissions can be verified at EPA's website

Also see: Total direct and indirect greenhouse gas emissions by weight (EN16)

For more information on what AEP is doing to reduce these emissions, also see Air Quality and Technology