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Oklahoma Regulated Air Pollutants


What must be reported in an Oklahoma Emissions Inventory?

1. Pollutants Regulated by Statue, Rule or Regulation
The large number of State toxic air contaminants that were previously regulated under Subchapter 41 of OAC 252:100 (the Oklahoma Air Pollution Control Rules) have been recently replaced by a much smaller number of toxics regulated under a new Subchapter, OAC 252:100-42.

There are now just 21 toxic compounds and compound groups regulated in Oklahoma and these are listed in Appendix O of OAC 252:100. All except Ammonia (NH3) are also part of the list of federally regulated Hazardous Air Pollutants (HAPs), which consists of 187 compounds and compound groups.

Also recently, Appendix P of OAC 252:100 was developed to list all air pollutants regulated in Oklahoma by a State or Federal rule or regulation in one convenient place. Appendix P, which was approved in June 2007, has no direct regulatory effect but it can be referred to determine whether a compound is an Oklahoma Regulated Air Pollutant (RAP).

The net result of these recent changes is that there is now a much simpler list of just over 200 RAPs for which emissions must be reported in an Oklahoma emissions inventory. However, it is important to remember that a particular compound group (e.g., Glycol Ethers) can contain many individual compounds that may previously have been reported individually. In addition, certain pollutants that may have been previously reported at the specific compound level ("speciated-out") to comply with Subchapter 41 should still be reported as part of a criteria pollutant total, e.g., Volatile Organic Compounds (VOCs).

2. Pollutants limited by Permit Only
The Specific Conditions of some air quality permits may limit emissions from a facility of a pollutant that is not one of the Oklahoma RAPs listed in Appendix P. Emissions of such pollutants must be reported per Subchapter 5 of OAC 252:100 which governs emissions inventory reporting. This page, Reporting Pollutants Limited by Permit Only, provides more details on how to handle these situations.

If you need further help with determining whether and how a particular pollutant should be reported then please contact the Emissions Inventory Section.

Page last updated: November 9, 2011



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